Toxic Stench 
Instant
Target nonblack creature gets -1/-1 until end of turn. Threshold — If seven or more cards are in your graveyard, instead destroy that creature. It can't be regenerated.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL