Morophon names a single creature type, and a wide suite of changelings (plus Maskwood Nexus) count as every type, so most creatures in the list get Morophon's free-colored-mana discount and its +1/+1 anthem. Generic-tribal payoffs from several tribes (Slivers, Spirits, Knights, Dragons, Scarecrows, Druids, Elementals, Demons) all switch on because changelings fill every tribe at once. Fist of Suns, Jodah and Leyline of Mutation make WUBRG an alternate cost that Morophon can fully discount, so spells of the chosen type become nearly or entirely free. How it wins: It floods the board with cheap or free anthem-boosted changelings and cross-tribal lords, then overwhelms opponents in combat with evasive, indestructible or hexproof attackers. Liliana's Contract is a backup win once four differently named "Demons" (changelings) are on the field. Key roles: - Every-type bodies: Changelings and type-granting effects let one creature satisfy every tribal payoff and Morophon's chosen type simultaneously (Maskwood Nexus, Irregular Cohort, Mirror Entity) - WUBRG alternate costs: Paying WUBRG instead of mana cost combines with Morophon's colored reduction to make chosen-type spells cost nothing, and makes Reaper King and Sliver Hivelord trivial (Fist of Suns, Jodah, Archmage Eternal, Leyline of Mutation) - Cross-tribal lords: Lords and tribe triggers grant keywords and effects to the whole changeling army, such as flying and haste, indestructibility, hexproof, removal on entry, mana, or copies (Sliver Hivelord, Reaper King, Miirym, Sentinel Wyrm) - Tribal cost and card engines: Type-based discounts, card draw and free deployment keep creatures flowing beyond Morophon (Herald's Horn, Vanquisher's Banner, Descendants' Path) - Mass deployment: Large creature counts are converted into explosive board refills, mana or copies (Kindred Summons, Three Tree City, Aeve, Progenitor Ooze) - One-sided sweepers: Wipes that spare the chosen tribe clear opposing boards while the changelings survive (Kindred Dominance, Crux of Fate, Ruinous Ultimatum)

Morophon, the Boundless decklist

• Aeve, Progenitor Ooze
• Amoeboid Changeling
• Arid Mesa
• Assassin's Trophy
• Avian Changeling
• Barkform Harvester
• Beast Within
• Birds of Paradise
• Black Market Connections
• Blood Crypt
• Bloodstained Mire
• Boseiju, Who Endures
• Breeding Pool
• Cavern of Souls
• Changeling Outcast
• Cloudshredder Sliver
• Command Tower
• Crux of Fate
• Cultivate
• Demonic Tutor
• Descendants' Path
• Drogskol Captain
• Eladamri's Call
• Faeburrow Elder
• Farseek
• Fist of Suns
• Flooded Strand
• 5× Forest
• Gemhide Sliver
• Generous Gift
• Gilt-Leaf Archdruid
• Godless Shrine
• Graveshifter
• Guardian Project
• Hallowed Fountain
• Harmonic Sliver
• Herald's Horn
• Heroic Intervention
• Impostor of the Sixth Pride
• Irregular Cohort
• Jodah, Archmage Eternal
• Kindred Dominance
• Kindred Summons
• Knight Exemplar
• Leyline of Mutation
• Leyline of the Guildpact
• Lightning Greaves
• Liliana's Contract
• Manaweft Sliver
• Marsh Flats
• Masked Vandal
• Maskwood Nexus
• Miirym, Sentinel Wyrm
• Mirror Entity
• Misty Rainforest
• Mothdust Changeling
• Nature's Lore
• Overgrown Tomb
• Path to Exile
• 3× Plains
• Polluted Delta
• Reaper King
• Risen Reef
• Ruinous Ultimatum
• Sacred Foundry
• Shapesharer
• Skeletal Changeling
• Skyshroud Claim
• Sliver Hivelord
• Stomping Ground
• 2× Swamp
• Swarmyard
• Swords to Plowshares
• Taurean Mauler
• Teferi's Protection
• Temple Garden
• The Great Henge
• The Ur-Dragon
• The World Tree
• Three Tree City
• Three Tree Mascot
• Three Visits
• Universal Automaton
• Unsettled Mariner
• Urza's Incubator
• Valiant Changeling
• Vanquisher's Banner
• Venomous Changeling
• Verdant Catacombs
• Watery Grave
• Windswept Heath
• Wooded Foothills