Phyrexian Dreadnought 
Artifact Creature — Phyrexian Dreadnought
Trample When this creature enters, sacrifice it unless you sacrifice any number of creatures with total power 12 or greater.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL