Foundry Helix 
Instant
As an additional cost to cast this spell, sacrifice a permanent. Foundry Helix deals 4 damage to any target. If the sacrificed permanent was an artifact, you gain 4 life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL