Tell-Tale Heart

You may have Tell Tale Heart enter the battlefield under an opponent's control.
When Tell Tale Heart enters the battlefield, sacrifice a creature and choose a creature you
control.
At the beginning of you upkeep, put a heartbeat counter on Tell Tale Heart, then roll six sided dice equal to the number of beat counters on Tell Tale Heart, if you roll higher than the chosen creature's converted mana cost, exile that creature. If you
didn't roll higher, put a heartbeat counter on Tell
Tale Heart.