Hollowborn Barghest is a rare Creature — Demon Dog card from Shadowmoor (SHM), collector number 68. Current market price: $0.31 (foil $1.07), TCGplayer market prices via Scryfall.
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.