Name:Bone Mask
ManaCost:4
Types:Artifact
A:AB$ ChooseSource | Cost$ 2 T | Choices$ Card | RememberChosen$ True | AILogic$ NeedsPrevention | SubAbility$ DBEffect | SpellDescription$ The next time a source of your choice would deal damage to you this turn, prevent that damage. Exile cards from the top of your library equal to the damage prevented this way.
SVar:DBEffect:DB$ Effect | ReplacementEffects$ RPreventNextFromSource | RememberObjects$ Remembered | SVars$ RPreventNextFromSource,ExileEffect,ExileFromLibInstead,X | SubAbility$ DBCleanup | ConditionDefined$ Remembered | ConditionPresent$ Card | ConditionCompare$ GE1
SVar:RPreventNextFromSource:Event$ DamageDone | ValidSource$ Card.IsRemembered | ValidTarget$ You | ReplaceWith$ ExileFromLibInstead | PreventionEffect$ True | Description$ The next time the chosen source deals damage to you, prevent that damage.
SVar:ExileFromLibInstead:DB$ Mill | Defined$ You | Destination$ Exile | NumCards$ X | References$ X
SVar:ExileEffect:DB$ ChangeZone | Defined$ Self | Origin$ Command | Destination$ Exile
SVar:X:ReplaceCount$DamageAmount
SVar:DBCleanup:DB$ Cleanup | ClearRemembered$ True
SVar:RemAIDeck:True
SVar:Picture:http://www.wizards.com/global/images/magic/general/bone_mask.jpg
Oracle:{2}, {T}: The next time a source of your choice would deal damage to you this turn, prevent that damage. Exile cards from the top of your library equal to the damage prevented this way.