Name:Hallow
ManaCost:W
Types:Instant
A:SP$ Effect | Cost$ W | ValidTgts$ Card.inZoneStack | TgtZone$ Stack,Battlefield | TgtPrompt$ Select target spell to prevent damage from | ReplacementEffects$ PreventDmg | Triggers$ TargetMoved | SVars$ GainLifeYou,X,ExileEffect | RememberObjects$ Targeted | SpellDescription$ Prevent all damage target spell would deal this turn. You gain life equal to the damage prevented this way.
SVar:PreventDmg:Event$ DamageDone | ValidSource$ Card.IsRemembered | ReplaceWith$ GainLifeYou | PreventionEffect$ True | Description$ Prevent all damage that would be dealt by targeted spell this turn. You gain life equal to the damage prevented this way.
SVar:GainLifeYou:AB$ GainLife | Cost$ 0 | Defined$ You | LifeAmount$ X | References$ X
SVar:X:ReplaceCount$DamageAmount
SVar:TargetMoved:Mode$ ChangesZone | ValidCard$ Card.IsRemembered | ExcludedDestinations$ Battlefield | Execute$ ExileEffect | TriggerZones$ Command | Static$ True
SVar:ExileEffect:DB$ ChangeZone | Defined$ Self | Origin$ Command | Destination$ Exile
SVar:RemAIDeck:True
SVar:Picture:http://www.wizards.com/global/images/magic/general/hallow.jpg
Oracle:Prevent all damage target spell would deal this turn. You gain life equal to the damage prevented this way.