Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Splinter, the Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Helping Hand

  W

  SorceryW

  Helping Hand puts Splinter, the Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Splinter, the Mentor 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 Splinter, the Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Teysa Karlov

  2WB

  Legendary Creature — Human AdvisorBW

  Teysa Karlov makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Drivnod, Carnage Dominus

  3BB

  Legendary Creature — Phyrexian HorrorB

  Drivnod, Carnage Dominus makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Annie Joins Up

  1RGW

  Legendary EnchantmentGRW

  Annie Joins Up makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Splinter, Radical Rat

  1W/BW/B

  Legendary Creature — Mutant Ninja RatBUW

  Splinter, Radical Rat makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• The Masamune

  3

  Legendary Artifact — EquipmentC

  The Masamune makes Splinter, the Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.