Name:Essence Harvest
ManaCost:2 B
Types:Sorcery
A:SP$ LoseLife | Cost$ 2 B | ValidTgts$ Player | TgtPrompt$ Select target player | LifeAmount$ X | SubAbility$ DBGainLife | References$ X | SpellDescription$ Target player loses X life and you gain X life, where X is the highest power amongst creatures you control.
SVar:DBGainLife:DB$ GainLife | Defined$ You | LifeAmount$ X | References$ X
SVar:X:Count$GreatestPower_Creature.YouCtrl
SVar:Picture:http://www.wizards.com/global/images/magic/general/essence_harvest.jpg
Oracle:Target player loses X life and you gain X life, where X is the greatest power among creatures you control.