Riverfall Mimic [Eventide] Nightmare Fish Beast its controller chooses target creature

its controller chooses target creature one of their opponents controls

Whenever you discard a card

Set: Amonkhet Type: Creature — Hippo Rarity: Uncommon Cost: {2}{G} When Defiant Greatmaw enters the battlefield

Set: Rivals of Ixalan Type: Creature — Human Pirate Rarity: Uncommon Cost: {R} As an additional cost to cast this spell

Riverfall Mimic [Eventide] Nightmare Fish Beast its controller chooses target creatureSet: Eventide Type: Creature Shapeshifter Rarity: Common Cost: {1}{U R} Whenever you cast a spell that's both blue and red, Riverfall Mimic has base power and toughness 3 3 until end of turn and can't be blocked this turn. Mimics don't hide their natural form well, but their disguises work well enough on boggarts.