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Creatures don't untap during their controllers' untap steps. Whenever a creature enters, untap all creatures.
Abilities, attacks, weakness & resistance
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Intruder Alarm (SLD-229) is a Rare Enchantment from the Secret Lair Drop set. It prevents creatures from untapping during their controllers' untap steps and instead triggers an untap of all creatures whenever a creature enters the battlefield. Players commonly pair it with token generators and enter-the-battlefield effects to enable repeated untap combos and large surprise attacks.
Catalog pricing data as of 16 Apr 2026, 03:22