Fatal Blow 
Instant
Destroy target creature that was dealt damage this turn. It can't be regenerated.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
Destroy target creature that was dealt damage this turn. It can't be regenerated.