Name:Lurking Predators
ManaCost:4 G G
Types:Enchantment
T:Mode$ SpellCast | ValidCard$ Card | ValidActivatingPlayer$ Opponent | TriggerZones$ Battlefield | Execute$ TrigDig | TriggerDescription$ Whenever an opponent casts a spell, reveal the top card of your library. If it's a creature card, put it onto the battlefield. Otherwise, you may put that card on the bottom of your library.
SVar:TrigDig:DB$ Dig | DigNum$ 1 | Reveal$ True | ChangeNum$ All | ChangeValid$ Creature | DestinationZone$ Battlefield | LibraryPosition2$ 0 | RememberChanged$ True | SubAbility$ DBDig
SVar:DBDig:DB$ Dig | DigNum$ 1 | DestinationZone$ Library | Optional$ True | LibraryPosition$ -1 | LibraryPosition2$ 0 | ConditionCheckSVar$ X | ConditionSVarCompare$ EQ0 | SubAbility$ DBCleanup | References$ X
SVar:X:Remembered$Amount
SVar:DBCleanup:DB$Cleanup | ClearRemembered$ True
SVar:Picture:http://www.wizards.com/global/images/magic/general/lurking_predators.jpg
Oracle:Whenever an opponent casts a spell, reveal the top card of your library. If it's a creature card, put it onto the battlefield. Otherwise, you may put that card on the bottom of your library.