Mirror Force

Instant Set {3}{r}{w} (You may cast this card face down as a colorless set enchantment for {2}. You may turn it face up any time you could cast an instant by paying its Instant Set cost; it is then cast like normal) You cannot cast Mirror Force except using its Instant Set ability. Mirror Force targets an attacking creature and deals damage to all creatures controlled by that creature’s controller equal to the target’s power.