Rules FAQ
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A triggered ability is any ability with a boldface precursor, such as an Action or a Reaction, including forced abilities.
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If King's Landing Septon is canceled, it will still return to hand.
The Seven.
Interrupt: When the effects of an opponent's triggered character, location, or attachment ability would initiate, return King's Landing Septon to your hand to cancel those effects.
Link: Decklists
Rules FAQ
A triggered ability is any ability with a boldface precursor, such as an Action or a Reaction, including forced abilities.
If King's Landing Septon is canceled, it will still return to hand.