Zlizzle, Voltaic Viper

Flash, Haste, First Strike
Whenever you cast an instant or sorcery card,
you may return Zlizzle to its owner's hand.
Whenever you cast an instant or sorcery card,
you may reveal Zlizzle from your hand. If you
do, exile that card after it resolves. Zlizzle's
power is equal to the total converted mana
cost of cards exiled this way.