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Rulings
Captain’s Hook becomes unattached from the creature it’s equipping if you equip it to a new creature, if Captain’s Hook leaves the battlefield, if the equipped creature ceases to be a creature, or if Captain’s Hook ceases to be an Equipment. (It also becomes unattached if the equipped creature leaves the battlefield, but the triggered ability won’t do anything in that case.)
Rulings
Captain’s Hook becomes unattached from the creature it’s equipping if you equip it to a new creature, if Captain’s Hook leaves the battlefield, if the equipped creature ceases to be a creature, or if Captain’s Hook ceases to be an Equipment. (It also becomes unattached if the equipped creature leaves the battlefield, but the triggered ability won’t do anything in that case.)
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