Mirror Prison

Flash
When Mirror Prison enters the battlefield, target
an attacking creature or a creature that has used
an activated ability this turn. Exile it, until
Mirror Prison leaves the battlefield. When you
do, put a cage counter on it, which is removed
when it leaves exile.
Enchanted Creature has "{u}: This creature gains
one activated or keyword ability of a card with
a cage counter on it until end of turn."
"Sorry my sister, but you raised a hand against me."