Clone
To play this you need an Air Neopet. When you play this card, you may discard a card from your hand to search your deck. You make take an Evil Sloth Clone #238 from your deck, show it to your opponent, and put it into your hand. Then shuffle your deck. When this Villain loses a contest, untap all of it's rivals.
You can destroy as many of these as you like; Sloth is just going to build more.