Enchantment — Aura, W (1)
Common
Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control and has first strike.
Metal is scarce, smiths are pricey, and plate mail is heavy.
Illus. Daarken

10/1/2012: Ethereal Armor counts each enchantment you control, including itself and any Auras you control attached to an opponent or to permanents controlled by an opponent.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern