See these four Maro articles for details

Intentional Design Skeleton



No Slot:
Republican Squire (creature, small, flying)
Fortitude of the Militia (instant)
Bleachbone Barricade (creature, medium, defender)
Corrupt Squire (creature, small, first strike, swampwalk)
Strength of Belief (enchantment)
Armored Griffin (creature, small, flying, vigilance)
Sumassian Auramancer (creature, small)
High Priest of Pyk (creature, small)
Darklight Caster (creature, small, vigilance)
Ragefilled Paladin (creature, small, haste, intimidate)
Wall of Deliberation (creature, small, defender)
Battle Hardened Militia (creature, small)
Lucent Lark (creature, small, flying)
Rousing Orator (creature, small)
Soldier's Runemark (enchantment, enchant)
Prisoner's Runemark (enchantment, enchant)
Enervating Spirit (creature, small, flying)
Legionary (creature, small)
Centurion (creature, small)
Auxiliary (creature, small)
Quaestor (creature, small)
Republican Airguard (creature, small, flying, haste)
Cunning of the Nobles (instant, shroud)
Ephemeral Wings (enchantment, flying)
Prejudice (instant)
Senate Scholar (creature, small)
Abrogate (instant)
Sealord's Runemark (enchantment, enchant)
Entrancer's Runemark (enchantment, enchant)
Delusional Therapist (creature, small, surge)
Remove the Outliers (sorcery)
Portal Sprite (creature, small, flash, flying)
Study Invocation (enchantment)
Rainbow Snidd (creature, medium)
Charm Distortion (instant)
Stormcloud Drake (creature, small, flying, haste)
Shimmersong (sorcery)
Apprentice Dispeller (creature, small)
Stable Mirage (enchantment, enchant)
Captivating Illusionist (creature, small)
Positive Reinforcement (sorcery)
Uncovered Knowledge (instant)
Experiment Strix (creature, small, flying, surge)
Slowpulse (sorcery)
Zhauri Pathmage (creature, small)
Dreams of Idara (instant)
Wily Sneak (creature, small)
Shifting Slime (enchantment, deathtouch)
Graft Slave (creature, small, surge)
Pykmarsh Adherant (creature, small)
Rustblade Lurcher (creature, small, deathtouch)
Ebon Duress (sorcery)
Aether Zombie (creature, small)
Gravetwist (instant)
Crumbling Bone Beast (creature, small)
Tract Shredder (creature, small)
Scar Marker (enchantment)
Essence Transfusion (instant)
Damassian Scout (creature, small, intimidate)
Death Rattle (instant, delve)
Grave Feast (sorcery, delve)
Pykmarsh Litany (sorcery)
Netherworld Knowledge (sorcery)
Republican Scout (creature, small, vigilance)
Courage of the Clans (instant, haste)
Prize Sow (creature, small)
Chromafire (sorcery)
Mogg Flunkies (creature, medium)
Pikeman's Runemark (enchantment, enchant, first strike)
Act on Impulse (sorcery)
Fury Harness (enchantment, enchant)
Charge Leader (creature, small, haste)
Irritable Hog (creature, small)
Capricious Imp (creature, small)
Rampaging Miners (creature, small)
Breath of Sumas (instant)
Hexfire (enchantment)
Unwavering Flame (instant)
Impulsiveness (sorcery)
Sparkeater (creature, large)
Farseek Elf (creature, small)
Mulch Hauler (creature, small)
Vitaloth (creature, large)
Grave Snapper (creature, small)
Protospore Murlodont (creature, medium)
Flickering Ferocity (enchantment, trample)
Freakish Elf (creature, small, surge)
Zhaur Cultivator (creature, small)
Idaran Bloomvine (creature, small)
Erupting Soil (sorcery, kicker)
Predator's Instinct (instant)
Debris Rummager (creature, small)
Pump Beast (creature, small)
Leatherhide Baloth (creature, medium)
Sundering Vines (instant)
Idaran Gardener (creature, small)
Terravision (sorcery)
Unbounded Growth (instant)
Fresh Terrain (sorcery)
New Domains (sorcery)
Bilepurge (instant)
Stygian Offering (instant, delve)
Eminent Domain (sorcery)
Moldering Rhox (creature, small, lifelink)
Crippling Hate (enchantment, enchant)
Blessed Pathwalker (creature, medium, lifelink)
Corpsehall Pathshambler (creature, medium)
Migrant Pathtracer (creature, medium, flying)
Mailed Pathwarden (creature, medium, first strike)
Elusive Pathstrider (creature, medium, shroud)
Corpse Eater (creature, large, delve)
Pyrohydrox (creature, small)
Fall of Titans (instant)
Runeveil (creature, small, defender, flying)
Seismic Slateback (creature, medium)
Unwilling Sacrifice (instant)
Driftwood Shambler (creature, small, shroud)
Gulfweed Barrier (creature, small, defender)
Element of Surprise (instant, first strike)
Mindscald (instant)
Substance Drain (instant)
Cobblebone Conscription (sorcery)
Local Knowledge (sorcery)
General's Fate (instant)
Survey the Corpsehalls (sorcery)
Shockbind (enchantment, enchant)
Tainted Citadel (land)
Mangrove Swamp (land)
Sigil of Death (artifact)
Sigil of Mutation (artifact)
Prismite (artifact creature, small)
UG Fetch Land (land)
Sigil of Hatred (artifact)
Pilum (artifact, equip)
Scutum (artifact, equip)
Ballista (artifact)
Idaran Triptych (artifact)
Zhauri Triptych (artifact)
Damassian Triptych (artifact)
Sumassian Triptych (artifact)
Pykmarsh Triptych (artifact)
Sigil of Defiance (artifact, hexproof)
Trimist Sphere (artifact)
Damassian Horizon (land)
Experimenter's Tools (artifact, equip, surge)
Hermit Golem (artifact creature, large)
Sigil of Action (artifact)
Draconic Cohort (creature, small, flying)
Frontline Zealot (creature, small, protection)
Soldier Training Camp (enchantment, vigilance)
Aquilifer (creature, small)
Magistrate (creature, small)
Pykmarsh Drifter (creature, medium, flying)
Shield of Faith (instant)
Penumbra Lion (creature, small)
Airguard Plateau (enchantment, flying)
Intuitive Progression (sorcery)
Regression Mage (creature, small)
Original Thinking (sorcery)
Haunting Denial (instant)
Frost Dragon (creature, medium, flying)
Sumassian Enchanter (creature, small, enchant, flash)
Unravel Thoughts (sorcery, flashback)
Soulseize (sorcery)
Battlefield Scourge (creature, small, flying)
Goreblade Raider (creature, small)
Mirror Tutor (sorcery)
Zealous Tutor (sorcery)
Bountiful Rebirth (sorcery)
Protection Racket (sorcery)
Graveyard Attendant (creature, small)
Scout Camp (enchantment, haste)
Impressment (sorcery, haste, kicker)
Gladiator (creature, small)
Archer's Runemark (enchantment, enchant)
Rockfall (sorcery)
Voidflame (sorcery)
Wild Abandon (enchantment)
Wild Knight (creature, small, first strike)
Bloodthirsty Savage (creature, small, double strike)
Burn Chamber (enchantment)
Momentary Evolution (instant, deathtouch, flying)
Fenleaper (creature, medium, flash)
Mega Explore (sorcery)
Growing Season (enchantment)
Micropede (creature, small, hexproof)
Zhaur Nullifier (creature, small, surge)
Surge Goliath (creature, medium, trample, surge)
Fickle Groundsman (creature, small, flash)
Totem Gatherer (creature, small)
Wurmheart Wizard (creature, small, trample)
Serpentheart Kavu (creature, small, haste, islandwalk)
Shadow Sentry (creature, small, shroud)
Subversive Charm (instant, haste)
Congressional Charm (instant)
Idolator's Charm (instant)
Tethered Psychopath (creature, small)
Laboratory Charm (instant)
Angelheart Zombie (creature, small, deathtouch, flying, vigilance)
Demonheart Leonin (creature, small, flying, lifelink, trample)
Dragonheart Aven (creature, small, flying, trample)
Grisly Surgeon (creature, small, surge)
Corpsehall Attendant (creature, small)
Man'O'War Elf (creature, small)
Battle Chaplain (creature, small, indestructible)
Brushfire (sorcery)
Essence Dredge (sorcery)
Veilbore (sorcery)
Abhorrent Oratory (creature, medium)
Delvefire (sorcery, delve)
Last Gasp Solution (sorcery)
Runemark Binder (creature, small)
Life from Limb (sorcery)
Skyblaze Arach (creature, medium, flying, reach)
Dictator's Charm (instant, haste, lifelink, vigilance)
Putrefactor (creature, small)
Voracious Mamba (creature, small, surge)
Hostile Takeover (sorcery)
Catapult (artifact)
Sumassian Aerie (land, flying)
Twilight Citadel (land)
Sumassian Peak (land)
Genesis Stone (artifact)
Zhaur Wetlands (land)
Pykmarsh Heath (land)
Sumassian Headlands (land)
Damassian Arena (land, haste)
Painted Herald (creature, small)
Clifftop Senate (land)
Idaran Treeline (land)
Damassian Tar Pits (land)
Desecrated Field (land)
Decrepit Hollow (land)
Weatherbeaten Isle (land)
Spellfeast Golem (creature, large, delve)
Ragged Seraph (creature, medium, flying, lifelink)
Winds of Wrath (sorcery)
Sumassian Transmogrifier (creature, small)
Tedious Bureaucrat (creature, medium)
Gather the Lost (sorcery, flying)
Idyllic Tutor (sorcery)
Sequester (enchantment, protection)
Chromagoyf (creature, small)
Call to Battle (enchantment, first strike, vigilance)
Flux Portal (enchantment)
Zhaur Trickster (creature, small, rebound)
Scatter the Firmament (sorcery, delve)
Demon Blacksmith (creature, small)
Deathbonder (creature, small)
Bloodbound Fiend (creature, large)
Thought Experiment (enchantment)
Blisterpig (creature, small)
Corpsevine Bonder (creature, small)
Graverobbing (enchantment, delve, dredge)
Fragility (enchantment)
Spinebreaker (creature, small, surge)
Infernal Reaper (creature, small)
Everlasting Life (enchantment, undying)
Tractslyph (creature, small)
Sneaky Goblin (creature, small, haste)
Planar Schism (sorcery)
Idaran Phoenix (creature, medium, flying)
Luna Rubrum Drakeling (creature, small, flying)
Renekton, the Final Fury (legendary creature, small, haste)
Vukosh, Demacian Champion (legendary creature, small)
Army of Ants (sorcery)
Eternal Onslaught (enchantment)
Keeper of Knowledge (creature, large, deathtouch)
Home Advantage (enchantment)
Protoplast Clone (creature, small, surge)
Splinterstorm (instant)
Coup d'état (sorcery)
Terrain Bond (enchantment)
Inspire the Reserves (enchantment, haste)
Cycle of Life (enchantment)
Saboteur School (enchantment)
Oozeworld (enchantment)
Test Subject Alpha (creature, medium, deathtouch, flying, trample, surge)
Ethelegad, Furious Vengeance (legendary creature, large, flying, haste)
Sumassian Nobleknight (creature, medium)
Manic Spellcasting (enchantment)
Sumassian Bureaucracy (enchantment)
Entrenched Power (sorcery)
Phase Battery (artifact)
Laboratory Garden (land)
Mirror Charm (artifact)
Moorland Sepulcher (land)
Leafy Grotto (land)
Hissing Fumarole (land)
Rugged Steppe (land)
Verdant Shore (land)
Ethereal Mox (artifact, delve)

Generated Design Skeleton

CW01 — creature, small, first strike, swampwalk
CW02 — creature, small
CW03 — creature, small, flying
CW04 — creature, small
CW05 — creature, small, vigilance
CW06 — creature, small
CW07 — creature, small
CW08 — creature, small, haste, intimidate
CW09 — creature, small, defender
CW10 — creature, small, flying
CW11 — creature, small
CW12 — creature, small, flying
CW13 — creature, small, flying, vigilance
CW14 — creature, small
CW15 — creature, small
CW16 — creature, small
CW17 — creature, medium, defender
CW18 — instant
CW19 — enchantment
CW20 — enchantment, enchant
CW21 — enchantment, enchant
CU01 — creature, small, surge
CU02 — creature, small, flash, flying
CU03 — creature, small
CU04 — creature, small, flying, surge
CU05 — creature, small
CU06 — creature, small
CU07 — creature, small, flying, haste
CU08 — creature, small
CU09 — creature, small, flying, haste
CU10 — creature, small
CU11 — creature, medium
CU12 — sorcery
CU13 — sorcery
CU14 — sorcery
CU15 — sorcery
CU16 — instant, shroud
CU17 — instant
CU18 — instant
CU19 — instant
CU20 — instant
CU21 — instant
CU22 — enchantment, flying
CU23 — enchantment, enchant
CU24 — enchantment, enchant
CU25 — enchantment
CU26 — enchantment, enchant
CB01 — creature, small, surge
CB02 — creature, small, deathtouch
CB03 — creature, small
CB04 — creature, small
CB05 — creature, small
CB06 — creature, small, intimidate
CB07 — creature, small
CB08 — sorcery
CB09 — sorcery, delve
CB10 — sorcery
CB11 — sorcery
CB12 — instant
CB13 — instant
CB14 — instant, delve
CB15 — enchantment, deathtouch
CB16 — enchantment
CR01 — creature, small, haste
CR02 — creature, small, vigilance
CR03 — creature, small
CR04 — creature, small
CR05 — creature, small
CR06 — creature, small
CR07 — creature, medium
CR08 — creature, large
CR09 — sorcery
CR10 — sorcery
CR11 — sorcery
CR12 — instant, haste
CR13 — instant
CR14 — instant
CR15 — enchantment, enchant, first strike
CR16 — enchantment, enchant
CR17 — enchantment
CG01 — creature, small
CG02 — creature, small
CG03 — creature, small
CG04 — creature, small, surge
CG05 — creature, small
CG06 — creature, small
CG07 — creature, small
CG08 — creature, small
CG09 — creature, small
CG10 — creature, medium
CG11 — creature, medium
CG12 — creature, large
CG13 — sorcery, kicker
CG14 — sorcery
CG15 — sorcery
CG16 — sorcery
CG17 — instant
CG18 — instant
CG19 — instant
CG20 — instant
CG21 — instant, delve
CG22 — enchantment, trample
CM01 — creature, small
CM02 — creature, small, defender, flying
CM03 — creature, small, defender
CM04 — creature, small, lifelink
CM05 — creature, small, shroud
CM06 — creature, medium, lifelink
CM07 — creature, medium, flying
CM08 — creature, medium, first strike
CM09 — creature, medium
CM10 — creature, medium, shroud
CM11 — creature, medium
CM12 — creature, large, delve
CM13 — sorcery
CM14 — sorcery
CM15 — sorcery
CM16 — sorcery
CM17 — instant
CM18 — instant
CM19 — instant, first strike
CM20 — instant
CM21 — instant
CM22 — instant
CM23 — enchantment, enchant
CM24 — enchantment, enchant
CC01 — artifact
CC02 — artifact
CC03 — artifact
CC04 — artifact, equip
CC05 — artifact, equip
CC06 — artifact
CC07 — artifact
CC08 — artifact
CC09 — artifact
CC10 — artifact
CC11 — artifact
CC12 — artifact, hexproof
CC13 — artifact
CC14 — artifact, equip, surge
CC15 — artifact
CC16 — artifact creature, small
CC17 — creature, small, flying
CC18 — artifact creature, large
CC19 — land
CC20 — land
CC21 — land
CC22 — land
UW01 — creature, small
UW02 — creature, small
UW03 — creature, small, protection
UW04 — creature, small
UW05 — creature, medium, flying
UW06 — instant
UW07 — enchantment, vigilance
UU01 — creature, small
UU02 — creature, small, enchant, flash
UU03 — creature, medium, flying
UU04 — sorcery
UU05 — sorcery
UU06 — instant
UU07 — enchantment, flying
UB01 — creature, small, flying
UB02 — creature, small
UB03 — creature, small
UB04 — sorcery, flashback
UB05 — sorcery
UB06 — sorcery
UB07 — sorcery
UB08 — sorcery
UB09 — sorcery
UR01 — creature, small, first strike
UR02 — creature, small, double strike
UR03 — creature, small
UR04 — sorcery, haste, kicker
UR05 — sorcery
UR06 — sorcery
UR07 — enchantment, haste
UR08 — enchantment, enchant
UR09 — enchantment
UR10 — enchantment
UG01 — creature, small, hexproof
UG02 — creature, small, surge
UG03 — creature, small, flash
UG04 — creature, small
UG05 — creature, medium, flash
UG06 — creature, medium, trample, surge
UG07 — sorcery
UG08 — instant, deathtouch, flying
UG09 — enchantment
UM01 — creature, small
UM02 — creature, small
UM03 — creature, small, surge
UM04 — creature, small, trample
UM05 — creature, small, haste, islandwalk
UM06 — creature, small, shroud
UM07 — creature, small, deathtouch, flying, vigilance
UM08 — creature, small, flying, lifelink, trample
UM09 — creature, small, flying, trample
UM10 — creature, small, surge
UM11 — creature, small
UM12 — creature, small, indestructible
UM13 — creature, small
UM14 — creature, small
UM15 — creature, medium, flying, reach
UM16 — creature, medium
UM17 — sorcery
UM18 — sorcery
UM19 — sorcery
UM20 — sorcery, delve
UM21 — sorcery
UM22 — sorcery
UM23 — sorcery
UM24 — instant, haste
UM25 — instant
UM26 — instant
UM27 — instant
UM28 — instant, haste, lifelink, vigilance
UC01 — artifact
UC02 — artifact
UC03 — creature, small
UC04 — creature, large, delve
UC05 — land, flying
UC06 — land
UC07 — land
UC08 — land
UC09 — land
UC10 — land
UC11 — land, haste
UC12 — land
UC13 — land
UC14 — land
UC15 — land
UC16 — land
UC17 — land
RW01 — creature, small
RW02 — creature, small
RW03 — creature, medium
RW04 — creature, medium, flying, lifelink
RW05 — sorcery
RW06 — sorcery, flying
RW07 — sorcery
RW08 — enchantment, protection
RW09 — enchantment, first strike, vigilance
RU01 — creature, small, rebound
RU02 — sorcery, delve
RU03 — enchantment
RB01 — creature, small
RB02 — creature, small
RB03 — creature, small, surge
RB04 — creature, small
RB05 — creature, small
RB06 — creature, small
RB07 — creature, large
RB08 — enchantment
RB09 — enchantment, delve, dredge
RB10 — enchantment
RB11 — enchantment, undying
RR01 — creature, small
RR02 — creature, small, haste
RR03 — legendary creature, small
RR04 — legendary creature, small, haste
RR05 — creature, small, flying
RR06 — creature, medium, flying
RR07 — sorcery
RG01 — sorcery
RG02 — enchantment
RM01 — creature, small, surge
RM02 — creature, medium, deathtouch, flying, trample, surge
RM03 — creature, medium
RM04 — creature, large, deathtouch
RM05 — legendary creature, large, flying, haste
RM06 — sorcery
RM07 — sorcery
RM08 — instant
RM09 — enchantment
RM10 — enchantment
RM11 — enchantment, haste
RM12 — enchantment
RM13 — enchantment
RM14 — enchantment
RM15 — enchantment
RM16 — enchantment
RC01 — artifact
RC02 — artifact
RC03 — artifact, delve
RC04 — land
RC05 — land
RC06 — land
RC07 — land
RC08 — land
RC09 — land