Down fall, "Reversal Quiz"
Send all cards in your hand and on your side of the field to the Graveyard. Call the Type of card (Monster, Spell, or Trap) on top of your Deck. If you call it right, exchange your current Life Points with your opponent's current ones.
Being that you are now guessing from the original top of the deck. This is because "Convulsions of Nature" is no Longer on the field. But i guess you could use "Convulsions of Nature"...and "Yadu Karu"...even though i hate him. That way you use "Yadu Karu"'s efect and put a card to the "bottom" which is actualy the top of the deck, play reversal and name the card you just placed there.