Innistrad Blightstalker

Devoid (This card has no color.)
Assassinate (This creature can attack creatures an
opponent controls as if that creature were a player.)
Whenever Innistrad Blightstalker attacks, you
may exile target creature card from a graveyard.
When you do, if it had keywords, Innistrad
Blightstalker gains those keywords until it leaves
the battlefield.