Name:Primeval Force ManaCost:2 G G G Types:Creature Elemental PT:8/8 T:Mode$ ChangesZone | Origin$ Any | Destination$ Battlefield | ValidCard$ Card.Self | Execute$ TrigSacUnless | TriggerDescription$ When CARDNAME enters the battlefield, sacrifice it unless you sacrifice three Forests. SVar:TrigSacUnless:AB$ Sacrifice | Cost$ 0 | Defined$ Self | UnlessCost$ Sac<3/Forest> | UnlessPayer$ You SVar:NeedsToPlayVar:Y GE3 SVar:Y:Count$Valid Forest.YouCtrl SVar:Picture:http://www.wizards.com/global/images/magic/general/primeval_force.jpg Oracle:When Primeval Force enters the battlefield, sacrifice it unless you sacrifice three Forests.