Kassus of Ios

{2}{b}: Create a 2/2 Corruption creature token
with "2{b}: Sacrifice a creature. Gain control of
target creature."
At the beginning of your end step, if you control
10 or more permanents you don't own, you win
the game.
There is no future for Ios. The corruption will consume
us all eventually. I might as well speed the process
along.