Mistway Spy
From Murders at Karlov Manor set


Mistway Spy
Creature — Merfolk Detective
1/1
Flying
Disguise (You may cast this card face down for as a 2/2 creature with ward . Turn it face up any time for its disguise cost.)
When this creature is turned face up, until end of turn, whenever a creature you control deals combat damage to a player, investigate.