name=Battle Mastery
url=http://magiccards.info/lw/en/5.html
image=http://mtgimage.com/card/battle%20mastery.jpg
value=3.458
rarity=U
type=Enchantment
subtype=Aura
cost={2}{W}
given_ability=double strike
timing=aura
enchant=first strike,pos creature