Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Thunderbreak Regent 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 Thunderbreak Regent 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 Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Animate Dead

  1B

  Enchantment — AuraB

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

  1B

  SorceryB

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

  G1B

  Sorcery // SorceryBG

  Life puts Thunderbreak Regent 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 Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Persist

  1B

  SorceryB

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

  BB

  SorceryB

  Soul Exchange puts Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Thunderbreak Regent'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 Thunderbreak Regent's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Rat King, Verminister

  1B

  Legendary Creature — Rat AvatarB

  Rat King, Verminister puts Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Thunderbreak Regent's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• The Flame of Keld

  1R

  Enchantment — SagaR

  Thunderbreak Regent deals damage, and The Flame of Keld makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Sefris of the Hidden Ways

  WUB

  Legendary Creature — Human WizardBUW

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

  2B

  EnchantmentB

  Recurring Nightmare puts Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• City on Fire

  5RRR

  EnchantmentR

  Thunderbreak Regent deals damage, and City on Fire makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Fiery Emancipation

  3RRR

  EnchantmentR

  Thunderbreak Regent deals damage, and Fiery Emancipation makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Sawhorn Nemesis

  3R

  Creature — DinosaurR

  Thunderbreak Regent deals damage, and Sawhorn Nemesis makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Rem Karolus, Stalwart Slayer

  1RW

  Legendary Creature — Human KnightRW

  Thunderbreak Regent deals damage, and Rem Karolus, Stalwart Slayer makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Twinflame Tyrant

  3RR

  Creature — DragonR

  Thunderbreak Regent deals damage, and Twinflame Tyrant makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Tor Wauki the Younger

  3BR

  Legendary Creature — Human ArcherBR

  Thunderbreak Regent deals damage, and Tor Wauki the Younger makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Victimize

  2B

  SorceryB

  Victimize puts Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Torbran, Thane of Red Fell

  1RRR

  Legendary Creature — Dwarf NobleR

  Thunderbreak Regent deals damage, and Torbran, Thane of Red Fell makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Ascent of the Worthy

  1WB

  Enchantment — SagaBW

  Ascent of the Worthy puts Thunderbreak Regent onto the battlefield from a graveyard without casting it, so its mana cost is never paid.