Hollow Specter is a rare Creature — Specter card from Legions (LGN), collector number 75. Current market price: $0.43 (foil $7.45), TCGplayer market prices via Scryfall.
Flying Whenever this creature deals combat damage to a player, you may pay {X}. If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card.