Name:Ajani's Aid
ManaCost:2 G W
Types:Enchantment
T:Mode$ ChangesZone | Origin$ Any | Destination$ Battlefield | ValidCard$ Card.Self | Execute$ TrigSearch | OptionalDecider$ You | TriggerDescription$ When CARDNAME enters the battlefield, you may search your library and/or graveyard for a card named Ajani, Valiant Protector, reveal it, and put it into your hand. If you search your library this way, shuffle it.
SVar:TrigSearch:DB$ ChangeZone | Origin$ Library,Graveyard | Destination$ Hand | ChangeType$ Card.namedAjani; Valiant Protector | ChangeNum$ 1 | Optional$ True
A:AB$ ChooseCard | Cost$ Sac<1/CARDNAME> | Choices$ Creature | AILogic$ NeedsPrevention | SubAbility$ DBEffect | SVars$ DBEffect | RememberChosen$ True | SpellDescription$ Prevent all combat damage a creature of your choice would deal this turn. 
SVar:DBEffect:DB$ Effect | ReplacementEffects$ RPreventNextFromSource | RememberObjects$ Remembered | SVars$ RPreventNextFromSource | SubAbility$ DBCleanup | ConditionDefined$ Remembered | ConditionPresent$ Card | ConditionCompare$ GE1 
SVar:RPreventNextFromSource:Event$ DamageDone | CombatDamage$ True | ValidSource$ Card.IsRemembered | Prevent$ True | PreventionEffect$ True | Description$ Prevent all combat damage a creature of your choice would deal this turn.
SVar:DBCleanup:DB$ Cleanup | ClearRemembered$ True 
SVar:Picture:http://www.wizards.com/global/images/magic/general/ajanis_aid.jpg
Oracle:When Ajani's Aid enters the battlefield, you may search your library and/or graveyard for a card named Ajani, Valiant Protector, reveal it, and put it into your hand. If you search your library this way, shuffle it.\nSacrifice Ajani's Aid: Prevent all combat damage a creature of your choice would deal this turn.