Enchant player
At the beginning of enchanted player's upkeep, an opponent declares a card type other than land. The enchanted player reveals the top card of his or her library. If it is the declared type, he or she puts that card into his or her graveyard and loses 3 life.
For Challenge # 013, in keeping with the fact that each submission has been a different color so far.
I figured I'd use a card type from Innistrad, since it seemed a perfect fit. I'm not really sure if I'm happy with this, but here it is anyway.