Decroux, Unseen Surprise

Whenever you commit a crime against an opponent, put a taunt counter on Decroux, Unseen Surprise.

You may look at the top card of your library at any time. Also, if the top card of your library is an instant spell with converted mana cost less than the number of taunt counters on Decroux, you may play it at any time. You may play this instant spell without playing its mana cost. Otherwise, the spell cannot be countered.