Nuke

{t} : Tap an untapped Ghost you control. if you
do, put a time counter on that ghost. At the
beginning of your next upkeep, remove a time
counter from that ghost. If you do, exile Nuke
with a time counter on it. At the beginning of
the following upkeep, remove Nuke from the
game and deal 4 damage to all tapped creatures
target opponent controls, then divide 12 damage
among all creatures and/or planeswalkers that
player controls.