Confidence:StrongSolidPlausibleTentativeSpeculative

• Brimaz, Blight of Oreskos

  2WB

  Legendary Creature — Phyrexian CatBW

  Brimaz, Blight of Oreskos proliferates, growing the counters Darksteel Reactor relies on.
• Vraska, Betrayal's Sting

  4BB/P

  Legendary Planeswalker — VraskaB

  Vraska, Betrayal's Sting proliferates, growing the counters Darksteel Reactor relies on.
• Tidus, Yuna's Guardian

  GWU

  Legendary Creature — Human WarriorGUW

  Tidus, Yuna's Guardian proliferates, growing the counters Darksteel Reactor relies on.
• Cacophony Scamp

  R

  Creature — Phyrexian Goblin WarriorR

  Cacophony Scamp proliferates, growing the counters Darksteel Reactor relies on.
• Metastatic Evangel

  1W

  Creature — Phyrexian Human ClericW

  Metastatic Evangel proliferates, growing the counters Darksteel Reactor relies on.
• Reject Imperfection

  1UU

  InstantU

  Reject Imperfection proliferates, growing the counters Darksteel Reactor relies on.
• Xavier Sal, Infested Captain

  BGU

  Legendary Creature — Human Fungus PirateBGU

  Xavier Sal, Infested Captain proliferates, growing the counters Darksteel Reactor relies on.
• Atraxa, Praetors' Voice

  GWUB

  Legendary Creature — Phyrexian Angel HorrorBGUW

  Atraxa, Praetors' Voice proliferates, growing the counters Darksteel Reactor relies on.
• Dreamtide Whale

  2U

  Creature — WhaleU

  Dreamtide Whale proliferates, growing the counters Darksteel Reactor relies on.
• Tromell, Seymour's Butler

  2G

  Legendary Creature — Elf AdvisorG

  Tromell, Seymour's Butler proliferates, growing the counters Darksteel Reactor relies on.
• Grateful Apparition

  1W

  Creature — SpiritW

  Grateful Apparition proliferates, growing the counters Darksteel Reactor relies on.
• Thrummingbird

  1U

  Creature — Phyrexian Bird HorrorU

  Thrummingbird proliferates, growing the counters Darksteel Reactor relies on.
• Bloated Contaminator

  2G

  Creature — Phyrexian BeastG

  Bloated Contaminator proliferates, growing the counters Darksteel Reactor relies on.
• Vexing Radgull

  1U

  Creature — Bird MutantU

  Vexing Radgull proliferates, growing the counters Darksteel Reactor relies on.
• Atomize

  2BG

  InstantBG

  Atomize proliferates, growing the counters Darksteel Reactor relies on.
• Kilo, Apogee Mind

  URW

  Legendary Artifact Creature — Robot ArtificerRUW

  Kilo, Apogee Mind proliferates, growing the counters Darksteel Reactor relies on.
• Fuel for the Cause

  2UU

  InstantU

  Fuel for the Cause proliferates, growing the counters Darksteel Reactor relies on.
• Contaminant Grafter

  4G

  Creature — Phyrexian DruidG

  Contaminant Grafter proliferates, growing the counters Darksteel Reactor relies on.
• The Great Goblin

  1B/RB/R

  Legendary Creature — Goblin NobleBR

  Both cards trigger when a counter is placed — they fire together.
• Patrolling Peacemaker

  2W

  Artifact Creature — Robot SoldierW

  Patrolling Peacemaker proliferates, growing the counters Darksteel Reactor relies on.
• Vivisurgeon's Insight

  3UU

  SorceryU

  Vivisurgeon's Insight proliferates, growing the counters Darksteel Reactor relies on.
• Drown in Ichor

  1B

  SorceryB

  Drown in Ichor proliferates, growing the counters Darksteel Reactor relies on.
• Huatli's Raptor

  GW

  Creature — DinosaurGW

  Huatli's Raptor proliferates, growing the counters Darksteel Reactor relies on.
• Cayth, Famed Mechanist

  1URW

  Legendary Creature — Dwarf ArtificerRUW

  Cayth, Famed Mechanist proliferates, growing the counters Darksteel Reactor relies on.
• Evolution Sage

  2G

  Creature — Elf DruidG

  Evolution Sage proliferates, growing the counters Darksteel Reactor relies on.