Confidence:StrongSolidPlausibleTentativeSpeculative

• Fain, the Broker

  2B

  Legendary Creature — Human WarlockB

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Hapatra, Vizier of Poisons

  BG

  Legendary Creature — Human ClericBG

  Both cards trigger when a counter is placed — they fire together.
• Hollowmurk Siege

  BG

  EnchantmentBG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Earth Kingdom General

  3G

  Creature — Human Soldier AllyG

  Both cards trigger when a counter is placed — they fire together.
• Auntie Ool, Cursewretch

  1BRG

  Legendary Creature — Goblin WarlockBGR

  Both cards trigger when a counter is placed — they fire together.
• Zimone, Paradox Sculptor

  2GU

  Legendary Creature — Human WizardGU

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Wickersmith's Tools

  3

  ArtifactC

  Both cards trigger when a counter is placed — they fire together.
• Kros, Defense Contractor

  1GWU

  Legendary Creature — Cat AdvisorGUW

  Both cards trigger when a counter is placed — they fire together.
• Ant-Man, Colony Commander

  1GU

  Legendary Creature — Human Rogue HeroGU

  Both cards trigger when a counter is placed — they fire together.
• Knight of Wundagore

  1G

  Creature — Cat Knight VillainG

  Both cards trigger when a counter is placed — they fire together.
• Obelisk Spider

  1BG

  Creature — SpiderBG

  Both cards trigger when a counter is placed — they fire together.
• Bomb Squad

  3R

  Creature — DwarfR

  Both cards trigger when a counter is placed — they fire together.
• Innkeeper's Talent

  1G

  Enchantment — ClassG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Paradox Zone

  4G

  EnchantmentG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Nest of Scarabs

  2B

  EnchantmentB

  Both cards trigger when a counter is placed — they fire together.
• The First Tyrannic War

  2GUR

  Enchantment — SagaGRU

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Flourishing Defenses

  4G

  EnchantmentG

  Both cards trigger when a counter is placed — they fire together.
• Arcade Cabinet

  3

  ArtifactC

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• All Will Be One

  3RR

  EnchantmentR

  Both cards trigger when a counter is placed — they fire together.
• Brimaz, Blight of Oreskos

  2WB

  Legendary Creature — Phyrexian CatBW

  Brimaz, Blight of Oreskos proliferates, growing the counters Captain Marvel, Apex Avenger relies on.
• Vraska, Betrayal's Sting

  4BB/P

  Legendary Planeswalker — VraskaB

  Vraska, Betrayal's Sting proliferates, growing the counters Captain Marvel, Apex Avenger relies on.
• Tidus, Yuna's Guardian

  GWU

  Legendary Creature — Human WarriorGUW

  Tidus, Yuna's Guardian proliferates, growing the counters Captain Marvel, Apex Avenger relies on.
• Cacophony Scamp

  R

  Creature — Phyrexian Goblin WarriorR

  Cacophony Scamp proliferates, growing the counters Captain Marvel, Apex Avenger relies on.
• Metastatic Evangel

  1W

  Creature — Phyrexian Human ClericW

  Metastatic Evangel proliferates, growing the counters Captain Marvel, Apex Avenger relies on.
• Reject Imperfection

  1UU

  InstantU

  Reject Imperfection proliferates, growing the counters Captain Marvel, Apex Avenger relies on.