Confidence:StrongSolidPlausibleTentativeSpeculative

• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Yore-Tiller Nephilim

  WUBR

  Creature — NephilimBRUW

  Yore-Tiller Nephilim puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Time Spiral

  4UU

  SorceryU

  Time Spiral untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

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

  2B

  EnchantmentB

  Recurring Nightmare puts Riptide Shapeshifter 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 Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Liliana, Waker of the Dead

  2BB

  Legendary Planeswalker — LilianaB

  Liliana, Waker of the Dead puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

  Exhume puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Hell's Caretaker

  3B

  Creature — HorrorB

  Hell's Caretaker puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

  Life puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Riptide Shapeshifter has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Kardur's Vicious Return

  2BR

  Enchantment — SagaBR

  Kardur's Vicious Return puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Dance of the Dead

  1B

  Enchantment — AuraB

  Dance of the Dead puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Meren of Clan Nel Toth

  2BG

  Legendary Creature — Human ShamanBG

  Meren of Clan Nel Toth puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Victimize

  2B

  SorceryB

  Victimize puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

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

  BB

  SorceryB

  Soul Exchange puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Rewind

  2UU

  InstantU

  Rewind untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Beledros Witherbloom

  5BG

  Legendary Creature — Elder DragonBG

  Beledros Witherbloom untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Finale of Revelation

  XUU

  SorceryU

  Finale of Revelation untaps lands, fueling Riptide Shapeshifter's mana-hungry effect.
• Ascent of the Worthy

  1WB

  Enchantment — SagaBW

  Ascent of the Worthy puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Rite of the Moth

  1WBB

  SorceryBW

  Rite of the Moth puts Riptide Shapeshifter onto the battlefield from a graveyard without casting it, so its mana cost is never paid.