Impostor

Vent {1}{b},{t} (Select an opponent or one of their creatures. That opponent then selects himself or
a creature. If your opponent selects what you selected, this ability is countered and Imposter is
sent to the graveyard; otherwise, Imposter gains deathtouch and indestructible then deals combat damage to what you selected.)
If Imposter kills a creature, its controller creates a
0/3 black Dead Body creature token with
defender.