Undercover Crocodelf

Creature — Elf Crocodile Detective • Mana cost: {4}{G}{U} • Murders at Karlov Manor • Common

Whenever this creature deals combat damage to a player, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Disguise {3}{G/U}{G/U} (You may cast this card face down for {3} as a 2/2 creature with ward {2}. Turn it face up any time for its disguise cost.)

Illustrated by Nicholas Gregory.