The Face Collector

{3}{r}{g}: Gain control of target nonland
permanent target opponent controls. Sacrifice
that permanent at the end of your next end step.
Whenever a permanent you control but don't own leaves the battlefield, put a +1/+1 counter onto
the Face Collector equal to that permanent's converted mana cost.
"It stalks soundlessly through the ancient groves,
taking the identities of those it comes across."