Confidence:StrongSolidPlausibleTentativeSpeculative

• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Rivalry'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

  Rivalry deals damage, and The Flame of Keld makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• City on Fire

  5RRR

  EnchantmentR

  Rivalry 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

  Rivalry 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

  Rivalry 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

  Rivalry 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

  Rivalry 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

  Rivalry deals damage, and Tor Wauki the Younger makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Torbran, Thane of Red Fell

  1RRR

  Legendary Creature — Dwarf NobleR

  Rivalry deals damage, and Torbran, Thane of Red Fell makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Gisela, Blade of Goldnight

  4RWW

  Legendary Creature — AngelRW

  Rivalry deals damage, and Gisela, Blade of Goldnight makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Spiked Corridor // Torture Pit

  3R3R

  Enchantment — Room // Enchantment — RoomR

  Rivalry deals damage, and Spiked Corridor makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Thor, Asgard's Avenger

  2RR

  Legendary Creature — God Warrior HeroR

  Rivalry deals damage, and Thor, Asgard's Avenger makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Lightning, Army of One

  1RW

  Legendary Creature — Human SoldierRW

  Rivalry deals damage, and Lightning, Army of One makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Solphim, Mayhem Dominus

  2RR

  Legendary Creature — Phyrexian HorrorR

  Rivalry deals damage, and Solphim, Mayhem Dominus makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Isengard Unleashed

  2RRR

  SorceryR

  Rivalry deals damage, and Isengard Unleashed makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Rankle and Torbran

  1BBRR

  Legendary Creature — Faerie DwarfBR

  Rivalry deals damage, and Rankle and Torbran makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Insult // Injury

  2R2R

  Sorcery // SorceryR

  Rivalry deals damage, and Insult makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Angrath's Marauders

  5RR

  Creature — Human PirateR

  Rivalry deals damage, and Angrath's Marauders makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Jaya, Venerated Firemage

  4R

  Legendary Planeswalker — JayaR

  Rivalry deals damage, and Jaya, Venerated Firemage makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Collective Inferno

  3RR

  EnchantmentR

  Rivalry deals damage, and Collective Inferno makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Embermaw Hellion

  3RR

  Creature — HellionR

  Rivalry deals damage, and Embermaw Hellion makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Fiendish Duo

  4RR

  Creature — DevilR

  Rivalry deals damage, and Fiendish Duo makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Tomik, Izzet Sparkmage

  1R

  Legendary Creature — Human WizardR

  Rivalry deals damage, and Tomik, Izzet Sparkmage makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Dictate of the Twin Gods

  3RR

  EnchantmentR

  Rivalry deals damage, and Dictate of the Twin Gods makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Furnace of Rath

  1RRR

  EnchantmentR

  Rivalry deals damage, and Furnace of Rath makes each hit bigger — it doubles, triples or adds to the damage your sources deal.