Name:Herald's Horn
ManaCost:3
Types:Artifact
K:ETBReplacement:Other:ChooseCT
SVar:ChooseCT:DB$ ChooseType | Defined$ You | Type$ Creature | SpellDescription$ As CARDNAME enters the battlefield, choose a creature type. | AILogic$ MostProminentInComputerDeck
S:Mode$ ReduceCost | ValidCard$ Creature.ChosenType | Type$ Spell | Activator$ You | Amount$ 1 | Description$ Creature spells of the chosen type you cast cost {1} less to cast.
T:Mode$ Phase | Phase$ Upkeep | ValidPlayer$ You | Execute$ TrigPeek | TriggerZones$ Battlefield | TriggerDescription$ At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.
SVar:TrigPeek:DB$ PeekAndReveal | PeekAmount$ 1 | RevealValid$ Creature.ChosenType | RevealOptional$ True | RememberRevealed$ True | SubAbility$ DBChangeZone
SVar:DBChangeZone:DB$ ChangeZone | Defined$ TopOfLibrary | Origin$ Library | Destination$ Hand | ConditionDefined$ Remembered | ConditionPresent$ Creature.ChosenType | ConditionCompare$ EQ1 | SubAbility$ DBCleanup
SVar:DBCleanup:DB$ Cleanup | ClearRemembered$ True 
SVar:Picture:http://www.wizards.com/global/images/magic/general/heralds_horn.jpg
Oracle:As Herald's Horn enters the battlefield, choose a creature type.\nCreature spells of the chosen type you cast cost {1} less to cast.\nAt the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.