Soulblast 
Instant
As an additional cost to cast this spell, sacrifice all creatures you control. Soulblast deals damage to any target equal to the total power of the sacrificed creatures.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL