Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Priest of Fell Rites

  WB

  Creature — Human WarlockBW

  Priest of Fell Rites puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Chandra, Flamecaller

  4RR

  Legendary Planeswalker — ChandraR

  Chandra, Flamecaller deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Animate Dead

  1B

  Enchantment — AuraB

  Animate Dead puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exhume

  1B

  SorceryB

  Exhume puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Let the Galaxy Burn

  X5R

  SorceryR

  Let the Galaxy Burn deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Chain Reaction

  2RR

  SorceryR

  Chain Reaction deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Jack of Hearts, Volatile Hero

  1RR

  Legendary Creature — Alien Human HeroR

  Jack of Hearts, Volatile Hero deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Godo, Bandit Warlord

  5R

  Legendary Creature — Human BarbarianR

  Godo, Bandit Warlord grants an extra combat phase, enabling Phantom Wurm's combat-trigger payoff.
• Dance of the Dead

  1B

  Enchantment — AuraB

  Dance of the Dead puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• All-Out Assault

  2RWB

  EnchantmentBRW

  All-Out Assault grants an extra combat phase, enabling Phantom Wurm's combat-trigger payoff.
• Persist

  1B

  SorceryB

  Persist puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Soul Exchange

  BB

  SorceryB

  Soul Exchange puts Phantom Wurm onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exocrine

  X2R

  Creature — TyranidR

  Exocrine deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Balthier and Fran

  1RG

  Legendary Creature — Human RabbitGR

  Balthier and Fran grants an extra combat phase, enabling Phantom Wurm's combat-trigger payoff.
• Bruce Banner // The Incredible Hulk

  U2RRGG

  Legendary Creature — Human Scientist Hero // Legendary Creature — Gamma Berserker HeroGRU

  Bruce Banner grants an extra combat phase, enabling Phantom Wurm's combat-trigger payoff.
• Cyclone

  2GG

  EnchantmentG

  Cyclone deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Swooping Pteranodon

  3RW

  Creature — DinosaurRW

  Swooping Pteranodon produces broad damage that redirects through Phantom Wurm into something useful.
• Subterranean Tremors

  XR

  SorceryR

  Subterranean Tremors deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Éomer, Marshal of Rohan

  2RR

  Legendary Creature — Human KnightR

  Éomer, Marshal of Rohan grants an extra combat phase, enabling Phantom Wurm's combat-trigger payoff.
• Fear of Missing Out

  1R

  Enchantment Creature — NightmareR

  Fear of Missing Out grants an extra combat phase, enabling Phantom Wurm's combat-trigger payoff.
• Heaven // Earth

  XGXRR

  Instant // SorceryGR

  Heaven deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.
• Fault Line

  XRR

  InstantR

  Fault Line deals damage to many targets, fueling Phantom Wurm's damage-payoff trigger.