Rage Shield

Cast this spell only if you have 5 or more rage counters.
Enchant creature with defender.
When Rage Shield enters the battlefield, return
each other Shield enchantment attached to
enchanted creature to its owner's hand.
Enchanted creature gets +X/+0, and can attack
as though it didn't have defender. X is equal to
the number of rage counters you have, to a
maximum of 10.