Bident of Thassa is a rare Legendary Enchantment Artifact card from The Lost Caverns of Ixalan Commander (LCC), collector number 146. Current market price: $0.50, TCGplayer market prices via Scryfall.
Whenever a creature you control deals combat damage to a player, you may draw a card. {1}{U}, {T}: Creatures your opponents control attack this turn if able.