Argos, Bureau's Exorcist

Whenever a Zombie, Skeleton, or another
reanimated creature leaves the battlefield, exile
it; you get an experience counter. Whenever you reanimate Argos, Bureau's Exorcist, you get two experience counters.
Whenever Argos attacks, choose one that hasn't
been chosen this turn from among first strike, trample, and +X/+0, where X is the amount of experience counters you have. Argos gets the
chosen effect until end of turn.