Name:Reverse Polarity
ManaCost:W W
Types:Instant
A:SP$ GainLife | Cost$ W W | Defined$ You | LifeAmount$ X | References$ X | SpellDescription$ You gain X life, where X is twice the damage dealt to you so far this turn by artifacts.
SVar:X:Count$YourTypeDamageThisTurn Artifact/Times.2
SVar:RemRandomDeck:True
SVar:Picture:http://www.wizards.com/global/images/magic/general/reverse_polarity.jpg
Oracle:You gain X life, where X is twice the damage dealt to you so far this turn by artifacts.