To play this, you need a Fire Neopet.
When you play this card, choose one of your Neopets and roll a die. If you roll a 1, discard that Neopet. (A Basic Neopet that's discarded is put on the bottom if its owner's Neopet stack.) Repeat this for each of your other Neopets (one at a time). Then your opponent does the same for each of his or her Neopets (one at a time). When this Villain loses a contest, untap all of its rivals.
Letting him out of the volcano was a HUGE mistake.