Confidence:StrongSolidPlausibleTentativeSpeculative

• Mikey & Leo, Chaos & Order

  G/WG/W

  Legendary Creature — Mutant Ninja TurtleGW

  Copper Longlegs proliferates, growing the counters Mikey & Leo, Chaos & Order relies on.
• Hollowmurk Siege

  BG

  EnchantmentBG

  Copper Longlegs proliferates, growing the counters Hollowmurk Siege relies on.
• Terrasymbiosis

  2G

  EnchantmentG

  Copper Longlegs proliferates, growing the counters Terrasymbiosis relies on.
• Ant-Man, Colony Commander

  1GU

  Legendary Creature — Human Rogue HeroGU

  Copper Longlegs proliferates, growing the counters Ant-Man, Colony Commander relies on.
• Aragorn, Company Leader

  1GW

  Legendary Creature — Human RangerGW

  Copper Longlegs proliferates, growing the counters Aragorn, Company Leader relies on.
• Moss-Pit Skeleton

  BG

  Creature — Plant SkeletonBG

  Copper Longlegs proliferates, growing the counters Moss-Pit Skeleton relies on.
• Deadly Designs

  1B

  EnchantmentB

  Copper Longlegs proliferates, growing the counters Deadly Designs relies on.
• Pensive Professor

  1UU

  Creature — Human WizardU

  Copper Longlegs proliferates, growing the counters Pensive Professor relies on.
• Darksteel Reactor

  4

  ArtifactC

  Copper Longlegs proliferates, growing the counters Darksteel Reactor relies on.
• Captain Marvel, Apex Avenger

  5RW

  Legendary Creature — Human Kree HeroRW

  Copper Longlegs proliferates, growing the counters Captain Marvel, Apex Avenger relies on.
• Animation Module

  1

  ArtifactC

  Copper Longlegs proliferates, growing the counters Animation Module relies on.
• Cloaked Cadet

  4G

  Creature — Human RangerG

  Copper Longlegs proliferates, growing the counters Cloaked Cadet relies on.
• Force Bubble

  2WW

  EnchantmentW

  Copper Longlegs proliferates, growing the counters Force Bubble relies on.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Copper Longlegs has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Rings of Brighthearth

  3

  ArtifactC

  Copper Longlegs has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.
• Illusionist's Bracers

  2

  Artifact — EquipmentC

  Copper Longlegs has activated abilities that aren't mana abilities, fueling Illusionist's Bracers's activation-trigger.