Hollowborn Barghest 
Creature — Demon Dog
At the beginning of your upkeep, if you have no cards in hand, each opponent loses 2 life. At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL