{R} Lazav, Wearer of Faces (Promo Pack) [Murders at Karlov Manor Promos][PP MKM 216]

Whenever Lazav attacks, exile target card from a graveyard, then investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, you may have Lazav become a copy of a creature card exiled with it until end of turn.