Four Dimensional bomb

{4} Deal 4 damage to any creature on the board.
{p/b}{p/b}{p/b} Untap this card.
{t} Exile 1 creature from your control; then
exile 1 nonland permanent of your opponet.
{1} Sacrifice this card.
When this is put in the graveyard you may
choose deal 4 damage to any creature, and
4 damage to yourself.