Killer Queen

When this creature enters the battlefield or deals combat damage to another player, put a
bomb counter on target artifact. There can only
be one bomb counter on the battlefield for each
Killer Queen you control.
When an artifact with a bomb counter triggers or activates an ability, deal 8 damage to that
artifact's controller and remove a bomb counter
from that artifact.
When this creature gets targeted by a Stand Arrow, transform Killer Queen into Another One
Bites The Dust