Heretical Harbinger

If you cast Heretical Harbinger, it enters the battlefield under the control of the opponent of
your choice.
At the beginning of your upkeep, put a +1/+1
counter on Heretical Harbinger. If it has three or
more +1/+1 counterson it, exile it and return it
to the battlefield under its owners control.
"Heresy isn't taken lightly. You are all warned."—Z