Confidence:StrongSolidPlausibleTentativeSpeculative

• Kasla, the Broken Halo

  3URW

  Legendary Creature — Angel AllyRUW

  Both cards trigger when you cast a spell — they fire together.
• Daughter of the Deep

  1U

  Creature — Merfolk NobleU

  Both cards produce the same kind of effect (shared token subtype).
• Song of the Worldsoul

  4WW

  EnchantmentW

  Both cards trigger when you cast a spell — they fire together.
• Flayer of Loyalties

  8CC

  Creature — EldraziC

  Both cards trigger when you cast a spell — they fire together.
• Aquatic Incursion

  3U

  EnchantmentU

  Both cards produce the same kind of effect (shared token subtype).
• Namora, the Sea Queen

  2U

  Legendary Creature — Mutant Merfolk HeroU

  Both cards produce the same kind of effect (shared token subtype).
• Stonybrook Schoolmaster

  2W

  Creature — Merfolk WizardW

  Both cards produce the same kind of effect (shared token subtype).
• Jungleborn Pioneer

  2G

  Creature — Merfolk ScoutG

  Both cards produce the same kind of effect (shared token subtype).
• Silvergill Mentor

  1U

  Creature — Merfolk WizardU

  Both cards produce the same kind of effect (shared token subtype).
• Witch-Maw Nephilim

  GWUB

  Creature — NephilimBGUW

  Both cards trigger when you cast a spell — they fire together.
• Inexorable Tide

  3UU

  EnchantmentU

  Both cards trigger when you cast a spell — they fire together.
• Benthicore

  6U

  Creature — ElementalU

  Both cards produce the same kind of effect (shared token subtype).
• Summon the School

  3W

  Kindred Sorcery — MerfolkW

  Both cards produce the same kind of effect (shared token subtype).
• Merrow Skyswimmer

  3W/UW/U

  Creature — Merfolk SoldierUW

  Both cards produce the same kind of effect (shared token subtype).
• Deeproot Pilgrimage

  1U

  EnchantmentU

  Both cards produce the same kind of effect (shared token subtype).
• A Killer Among Us

  4G

  EnchantmentG

  Both cards produce the same kind of effect (shared token subtype).
• Wanderwine Farewell

  5UU

  Kindred Sorcery — MerfolkU

  Both cards produce the same kind of effect (shared token subtype).
• Ugin, Eye of the Storms

  7

  Legendary Planeswalker — UginC

  Both cards trigger when you cast a spell — they fire together.
• Riku of Many Paths

  GUR

  Legendary Creature — Human WizardGRU

  Both cards trigger when you cast a spell — they fire together.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Both cards trigger when you cast a spell — they fire together.
• Song of Creation

  1GUR

  EnchantmentGRU

  Both cards trigger when you cast a spell — they fire together.
• Runaway Steam-Kin

  1R

  Creature — ElementalR

  Both cards trigger when you cast a spell — they fire together.
• Jenson Carthalion, Druid Exile

  GW

  Legendary Creature — Human DruidBGRUW

  Both cards trigger when you cast a spell — they fire together.
• Mercurial Spelldancer

  1U

  Creature — Phyrexian RogueU

  Both cards trigger when you cast a spell — they fire together.
• Geometer's Arthropod

  GU

  Creature — Fractal CrabGU

  Both cards trigger when you cast a spell — they fire together.