Bident of Thassa
Legendary Enchantment Artifact
Oracle Text
Whenever a creature you control deals combat damage to a player, you may draw a card.
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: Creatures your opponents control attack this turn if able.
Rulings (2)
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Wizards of the CoastIf a creature can't attack for any reason (such as being tapped or having come under that player's control that turn), then it doesn't attack. If there's a cost associated with having a creature attack, the player isn't forced to pay that cost, so it doesn't have to attack in that case either.
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Wizards of the CoastThe controller of each attacking creature still chooses which player or planeswalker that creature attacks.