Primeval Force 
Creature — Elemental
When this creature enters, sacrifice it unless you sacrifice three Forests.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Elemental
When this creature enters, sacrifice it unless you sacrifice three Forests.