Vengeful Insanity

Exile the top X cards of your library where X is the amount of live you lost this turn. Target player loses X live unless he or she exiles the top
X cards of his or her library twice.
Pay 5 life, Exile this card from your graveyard:
You may cast a nonland card with converted manacost 4 or less exiled with Vengeful Insanity without paying it's manacost.