Kathril, Aspect Warper is built around loading the graveyard with creatures that collectively possess a wide spread of keyword abilities — flying, double strike, indestructible, hexproof, deathtouch, and more — so that when Kathril enters, those keywords are distributed as counters across your creatures while Kathril itself grows massive. The deck mills and self-fills the graveyard through cycling, upkeep mill effects, and creatures that reveal or dump cards on entry, then uses reanimation and recursion to rebuild the board while Kathril and keyword-sharing creatures like Odric, Lunarch Marshal or Majestic Myriarch turn the entire team into a swiss army knife of combat threats. The win condition is swinging with an army of creatures each bearing a cocktail of evasion and protection keywords, overwhelming opponents through combat while being nearly impossible to block or destroy cleanly.

Symbiotic Swarm decklist

• Ajani Unyielding
• Tayam, Luminous Enigma
• Nikara, Lair Scavenger
• Yannik, Scavenging Sentinel
• Avenging Huntbonder
• Cartographer's Hawk
• Vitality Hunter
• Daring Fiendbonder
• Slippery Bogbonder
• Akroma, Angel of Wrath
• Angel of Finality
• Cataclysmic Gearhulk
• Kalemne's Captain
• Odric, Lunarch Marshal
• Reveillark
• Solemn Recruit
• Sunblast Angel
• Zetalpa, Primal Dawn
• Cairn Wanderer
• Soul of Innistrad
• Soulflayer
• Hornet Queen
• Majestic Myriarch
• Splinterfright
• Archon of Valor's Reach
• Karametra, God of Harvests
• Void Beckoner
• Titanoth Rex
• Aerial Responder
• Vampire Nighthawk
• Acidic Slime
• Sakura-Tribe Elder
• Satyr Wayfinder
• Skullwinder
• Nyx Weaver
• Selective Adaptation
• Ever After
• Duneblast
• Unbreakable Bond
• Unburial Rites
• Cultivate
• Harmonize
• Obscuring Haze
• Blood Curdle
• Abzan Charm
• Deathsprout
• Despark
• Grisly Salvage
• Netherborn Altar
• Mimic Vat
• Bonder's Ornament
• Arcane Signet
• Commander's Sphere
• Sol Ring
• Swiftfoot Boots
• Together Forever
• Abzan Ascendancy
• Deadbridge Chant
• Martial Impetus
• Parasitic Impetus
• Predatory Impetus
• Nesting Grounds
• Canopy Vista
• Caves of Koilos
• Exotic Orchard
• Gavony Township
• Grim Backwoods
• Sungrass Prairie
• Blighted Woodland
• Command Tower
• Golgari Rot Farm
• Krosan Verge
• Memorial to Folly
• Myriad Landscape
• Orzhov Basilica
• Sandsteppe Citadel
• Selesnya Sanctuary
• Blossoming Sands
• Evolving Wilds
• Jungle Hollow
• Scoured Barrens
• 3× Plains
• 2× Plains
• 2× Plains
• 3× Swamp
• 2× Swamp
• 2× Swamp
• 2× Forest
• Forest
• Forest