Confidence:StrongSolidPlausibleTentativeSpeculative

• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Deadly Designs's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Brimaz, Blight of Oreskos

  2WB

  Legendary Creature — Phyrexian CatBW

  Brimaz, Blight of Oreskos proliferates, growing the counters Deadly Designs relies on.
• Tidus, Yuna's Guardian

  GWU

  Legendary Creature — Human WarriorGUW

  Tidus, Yuna's Guardian proliferates, growing the counters Deadly Designs relies on.
• Metastatic Evangel

  1W

  Creature — Phyrexian Human ClericW

  Metastatic Evangel proliferates, growing the counters Deadly Designs relies on.
• Reject Imperfection

  1UU

  InstantU

  Reject Imperfection proliferates, growing the counters Deadly Designs relies on.
• Atraxa, Praetors' Voice

  GWUB

  Legendary Creature — Phyrexian Angel HorrorBGUW

  Atraxa, Praetors' Voice proliferates, growing the counters Deadly Designs relies on.
• Atomize

  2BG

  InstantBG

  Atomize proliferates, growing the counters Deadly Designs relies on.
• Dreamtide Whale

  2U

  Creature — WhaleU

  Dreamtide Whale proliferates, growing the counters Deadly Designs relies on.
• Xavier Sal, Infested Captain

  BGU

  Legendary Creature — Human Fungus PirateBGU

  Xavier Sal, Infested Captain proliferates, growing the counters Deadly Designs relies on.
• Fuel for the Cause

  2UU

  InstantU

  Fuel for the Cause proliferates, growing the counters Deadly Designs relies on.
• Kilo, Apogee Mind

  URW

  Legendary Artifact Creature — Robot ArtificerRUW

  Kilo, Apogee Mind proliferates, growing the counters Deadly Designs relies on.
• Drown in Ichor

  1B

  SorceryB

  Drown in Ichor proliferates, growing the counters Deadly Designs relies on.
• Patrolling Peacemaker

  2W

  Artifact Creature — Robot SoldierW

  Patrolling Peacemaker proliferates, growing the counters Deadly Designs relies on.
• Grateful Apparition

  1W

  Creature — SpiritW

  Grateful Apparition proliferates, growing the counters Deadly Designs relies on.
• Thrummingbird

  1U

  Creature — Phyrexian Bird HorrorU

  Thrummingbird proliferates, growing the counters Deadly Designs relies on.
• Vivisurgeon's Insight

  3UU

  SorceryU

  Vivisurgeon's Insight proliferates, growing the counters Deadly Designs relies on.
• Vraska, Betrayal's Sting

  4BB/P

  Legendary Planeswalker — VraskaB

  Vraska, Betrayal's Sting proliferates, growing the counters Deadly Designs relies on.
• Huatli's Raptor

  GW

  Creature — DinosaurGW

  Huatli's Raptor proliferates, growing the counters Deadly Designs relies on.
• Vexing Radgull

  1U

  Creature — Bird MutantU

  Vexing Radgull proliferates, growing the counters Deadly Designs relies on.
• Bloated Contaminator

  2G

  Creature — Phyrexian BeastG

  Bloated Contaminator proliferates, growing the counters Deadly Designs relies on.
• Evolution Sage

  2G

  Creature — Elf DruidG

  Evolution Sage proliferates, growing the counters Deadly Designs relies on.
• Experimental Augury

  1U

  InstantU

  Experimental Augury proliferates, growing the counters Deadly Designs relies on.
• Volt Charge

  2R

  InstantR

  Volt Charge proliferates, growing the counters Deadly Designs relies on.
• Serum Snare

  1U

  InstantU

  Serum Snare proliferates, growing the counters Deadly Designs relies on.
• Yawgmoth, Thran Physician

  2BB

  Legendary Creature — Human ClericB

  Yawgmoth, Thran Physician proliferates, growing the counters Deadly Designs relies on.