Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts War-Trained Slasher 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 War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

  Sefris of the Hidden Ways puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Recurring Nightmare

  2B

  EnchantmentB

  Recurring Nightmare puts War-Trained Slasher 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 War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

  Animate Dead puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Exhume

  1B

  SorceryB

  Exhume puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts War-Trained Slasher 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 War-Trained Slasher's combat-trigger payoff.
• Dance of the Dead

  1B

  Enchantment — AuraB

  Dance of the Dead puts War-Trained Slasher 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 War-Trained Slasher's combat-trigger payoff.
• Victimize

  2B

  SorceryB

  Victimize puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

  Persist puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Soul Exchange

  BB

  SorceryB

  Soul Exchange puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Zariel, Archduke of Avernus

  2RR

  Legendary Planeswalker — ZarielR

  Zariel, Archduke of Avernus grants an extra combat phase, enabling War-Trained Slasher's combat-trigger payoff.
• Balthier and Fran

  1RG

  Legendary Creature — Human RabbitGR

  Balthier and Fran grants an extra combat phase, enabling War-Trained Slasher'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 War-Trained Slasher's combat-trigger payoff.
• Ral Zarek

  2UR

  Legendary Planeswalker — RalRU

  Ral Zarek grants an extra turn, enabling War-Trained Slasher's per-turn payoff.
• Ascent of the Worthy

  1WB

  Enchantment — SagaBW

  Ascent of the Worthy puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Éomer, Marshal of Rohan

  2RR

  Legendary Creature — Human KnightR

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

  1R

  Enchantment Creature — NightmareR

  Fear of Missing Out grants an extra combat phase, enabling War-Trained Slasher's combat-trigger payoff.
• Necromancy

  2B

  EnchantmentB

  Necromancy puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Too Evil to Stay Dead

  2B

  SorceryB

  Too Evil to Stay Dead puts War-Trained Slasher onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Bumi, Unleashed

  3RG

  Legendary Creature — Human Noble AllyGR

  Bumi, Unleashed grants an extra combat phase, enabling War-Trained Slasher's combat-trigger payoff.
• Aurelia, the Warleader

  2RRWW

  Legendary Creature — AngelRW

  Aurelia, the Warleader grants an extra combat phase, enabling War-Trained Slasher's combat-trigger payoff.