Killer Queen

When Killer Queen enters the battlefield, put 2 explosion counters on target creature. Remove an explosion counter from all creatures during your upkeep. When a creature has 1 explosion counter,
exile that creature.
{1}{r}: Killer Queen's First Bomb—Deal 3 damage
to any target. Activate this ability no more than
twice a turn.
{2}{b}{r}: Sheer Heart Attack—Add 2 explosion counters to the opponent's highest power
creature.