Confidence:StrongSolidPlausibleTentativeSpeculative

• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling Thundercloud Elemental's mana-hungry effect.
• Liliana, Death's Majesty

  3BB

  Legendary Planeswalker — LilianaB

  Liliana, Death's Majesty puts Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

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

  WUBR

  Creature — NephilimBRUW

  Yore-Tiller Nephilim puts Thundercloud Elemental 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 Thundercloud Elemental's mana-hungry effect.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

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

  2B

  EnchantmentB

  Recurring Nightmare puts Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unfinished Business

  3WW

  SorceryW

  Unfinished Business puts Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Forum Necroscribe

  5B

  Creature — Troll WarlockB

  Forum Necroscribe puts Thundercloud Elemental 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 Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Kroxa and Kunoros

  3RWB

  Legendary Creature — Elder Giant DogBRW

  Kroxa and Kunoros puts Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• The Cruelty of Gix

  3BB

  Enchantment — SagaB

  The Cruelty of Gix puts Thundercloud Elemental 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 Thundercloud Elemental 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 Thundercloud Elemental's mana-hungry effect.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

  Exhume puts Thundercloud Elemental 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 Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Archpriest of Shadows

  3BB

  Creature — Human WarlockB

  Archpriest of Shadows puts Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Life // Death

  G1B

  Sorcery // SorceryBG

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

  2U

  Legendary Creature — Elf NobleU

  Thundercloud Elemental 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 Thundercloud Elemental 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 Thundercloud Elemental 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 Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Victimize

  2B

  SorceryB

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

  1B

  SorceryB

  Persist puts Thundercloud Elemental onto the battlefield from a graveyard without casting it, so its mana cost is never paid.