Iosefka's Imposter

Once per turn if a creature dies, put a Knowledge counter on Iosefka Impostor. If Iosefka Impostor has two or more Knowledge counters, draw a card.

{t}: Iosefka Impostor deals damage equal to its power to target creature. If that creature dies this turn, create a 1/1 blue Celestial Emissary token.