This deck exploits the universal creature type sharing of Changeling creatures alongside Sliver tribal synergies, using the fact that every Changeling counts as a Sliver to fuel an ever-growing board of creatures that grant each other flying, deathtouch, lifelink, trample, and other keyword abilities. Sliver Legion and Thrumming Hivepool serve as force multipliers, turning the wide token-generating and changeling-creature-flooding gameplan into an overwhelming combat-focused board state boosted by Shared Animosity and Stoneforge Masterwork. The Ur-Dragon serves as an eminence-discounted aerial threat that generates massive card advantage and free permanent drops whenever Dragons attack, giving the deck a secondary dimension where even a single attack can snowball into an insurmountable advantage.

Ur-doption Agency decklist

• Island
• Mountain
• 3× Plains
• Forest
• Swamp
• Arcane Signet
• Command Tower
• Crib Swap
• Cultivate
• Farseek
• Ghostly Changeling
• Mirror Entity
• Nature's Lore
• Rampant Growth
• Swords to Plowshares
• Taurean Mauler
• Unclaimed Territory
• Distant Melody
• Commander's Sphere
• Kindred Discovery
• Path of Ancestry
• Flooded Strand
• Patriarch's Bidding
• Sliver Legion
• Breeding Pool
• Godless Shrine
• Stomping Ground
• Watery Grave
• Skyshroud Claim
• Overgrown Tomb
• Temple Garden
• Arid Mesa
• Marsh Flats
• Misty Rainforest
• Verdant Catacombs
• Wooded Foothills
• Horned Sliver
• Sliver Hive
• Avian Changeling
• War-Spike Changeling
• Mutavault
• Changeling Outcast
• Brood Sliver
• Synapse Sliver
• Indatha Triome
• Ketria Triome
• Raugrin Triome
• Zagoth Triome
• Gemhide Sliver
• Moonglove Changeling
• Galerider Sliver
• Syphon Sliver
• Stoneforge Masterwork
• Necrotic Sliver
• Realmwalker
• Reflections of Littjara
• The World Tree
• Graveshifter
• Irregular Cohort
• Morophon, the Boundless
• Unsettled Mariner
• Valiant Changeling
• Venomous Changeling
• Shared Animosity
• Venom Sliver
• Three Visits
• Secluded Courtyard
• Jetmir's Garden
• Spara's Headquarters
• Ziatora's Proving Ground
• Voja, Jaws of the Conclave
• Barkform Harvester
• Patchwork Banner
• Three Tree Mascot
• Formless Genesis
• Mox Jasper
• Thrumming Hivepool
• Mutable Explorer
• Chomping Changeling
• Harmonized Crescendo
• Springleaf Parade
• Abundant Countryside
• Belonging
• Rooftop Percher
• And They Shall Know No Fear
• Bloodline Pretender
• Mistwalker
• Lazotep Sliver
• For the Ancestors
• Firdoch Core
• Chitinous Graspling
• Changeling Wayfinder
• Heroic Intervention
• Kindred Dominance
• Maskwood Nexus
• Path to Exile
• Vanquisher's Banner