Circus Trainer

When you cast this card, you may sacrifice a creature. If you do, destroy target creature.

Flaming Whip—{b}, {t}: Put a -1/-1 counter on target creature.

"I understand you've had a rather hard time lately. That's too bad. You've probably felt you had no choice but to behave outrageously, like a wild animal. But don't worry, you won't anymore, because I am going to break you."