Floodpits Drowner is a uncommon Creature — Merfolk card from Duskmourn: House of Horror (DSK), collector number 59. Current market price: $0.45 (foil $0.59), TCGplayer market prices via Scryfall.
Flash Vigilance When this creature enters, tap target creature an opponent controls and put a stun counter on it. {1}{U}, {T}: Shuffle this creature and target creature with a stun counter on it into their owners' libraries.