If Chained to the Rocks leaves the battlefield before its triggered ability resolves, the target creature won't be exiled.
Chained to the Rocks
Chained to the Rocks's ability causes a zone change with a duration, a style of ability introduced in Magic 2014 that's somewhat reminiscent of older cards like Oblivion Ring. However, unlike Oblivion Ring, cards like Chained to the Rocks have a single ability that creates two one-shot effects: one that exiles the creature when the ability resolves, and another that returns the exiled card to the battlefield immediately after Chained to the Rocks leaves the battlefield.
The exiled card returns to the battlefield immediately after Chained to the Rocks leaves the battlefield. Nothing happens between the two events, including state-based actions.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Aaron Miller
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
