Animated Armor

When Animated Armor enters the battlefield,
attach it to target creature you control.
Equipped creature gets +1/+1 and has hexproof
and "{x}{u}, Unattach Animated Armor: Put X
+1/+1 counters on Animated Armor and draw
a card. Activate only as a sorcery."
As long as Animated Armor isn't attached to a creature, it's a 0/0 colorless artifact creature that
can't be blocked.