Riverfall Mimic [Eventide]

Set: Eventide Type: Creature — Shapeshifter 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.