Intruder Alarm
Enchantment
Creatures don't untap during their controllers' untap steps.
Whenever a creature enters, untap all creatures.
- CMC
- 3
- Mana cost
- Color identity
- U
- Rarity
- rare
- Set
- Wilds of Eldraine: Enchanting Tales
- Price
- $4.36
- EDHREC rank
- #1712
Intruder Alarm untaps all creatures whenever any creature enters the battlefield — a symmetrical effect that reads as a drawback until you build around it, at which point it becomes one of the most explosive combo pieces in Commander. Two blue mana for an enchantment that turns every creature ETB into a mana or ability reset is the exact trade-off that makes Hullbreaker Horror loops click and The Master, Transcendent grind through an entire deck in a single turn.
Best Commanders
Commanders with the highest synergy
The Master, Transcendent
The Master, Transcendent taps creatures to convert them into Dalek tokens, and Intruder Alarm untaps those creatures every time a new Dalek hits the battlefield — the result is an unbounded loop that generates infinite tokens and infinite tap activations from a single tapped creature and any external mana source.
Phelddagrif
Phelddagrif gives opponents Hippo tokens, and Intruder Alarm turns every gifted token into a free untap of your whole board — in group hug shells this translates to unlimited mana from tapped dorks or infinite activations of any tap ability you control.
Kumena, Tyrant of Orazca
Kumena, Tyrant of Orazca taps Merfolk to draw cards, pump the team, or put +1/+1 counters on creatures, and Intruder Alarm resets the entire squad every time another Merfolk enters — with even modest tribal density, Kumena churns through the deck and closes the game in the same turn.
Xavier Sal, Infested Captain
Xavier Sal, Infested Captain creates Pest tokens on creature deaths, and Intruder Alarm converts each new Pest ETB into a full board untap — any sacrifice outlet with a mana-positive loop closes the game immediately, and Intruder Alarm is the glue that makes the engine self-sustaining.
Chulane, Teller of Tales
Chulane, Teller of Tales draws a card and returns a land to hand whenever you cast a creature, so pairing him with Intruder Alarm and any mana-producing creature that costs one or less produces an infinite draw and land-drop loop that empties the deck before opponents can respond.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Commander is by far the format where Intruder Alarm does its best work — the singleton rule means you build around it rather than stack copies, and the multiplayer table supplies a constant stream of creature ETBs that make the untap trigger fire repeatedly even when it's not your turn. In Legacy and Vintage the card is legal but almost never played, because those formats demand faster, more redundant combo infrastructure and Intruder Alarm's payoff requires creature-based setup that faster engines render irrelevant. Oathbreaker mirrors Commander closely enough that the same token and tap-ability loops apply, and any Planeswalker commander with a creature-generating minus ability can abuse it. The short version: Intruder Alarm is a Commander card wearing a universal legal status.
Key Combos
Combo lines featuring this card
Hullbreaker HorrorIntruder Alarm
Infinite storm count; Infinite untap of creatures; Infinite untap of creatures you control; Infinite ETB; Infinite LTB; Infinite mana creatures you control can produce
View on Commander Spellbook ↗Chulane, Teller of TalesIntruder Alarm
Infinite card draw; Infinite draw triggers; Near-infinite ETB; Near-infinite landfall triggers; Near-infinite LTB; Near-infinite mana creatures you control can produce; Near-infinite storm count; Near-infinite untap of all creatures; Put all lands from your hand and library onto the battlefield
View on Commander Spellbook ↗
Shorikai, Genesis EngineIntruder Alarm
Infinite self-discard triggers; Near-infinite ETB; Infinite draw triggers; Near-infinite creature tokens; Near-infinite card draw; Near-infinite untap of all creatures; Near-infinite looting
View on Commander Spellbook ↗
Intruder AlarmShrieking Drake
Infinite ETB; Infinite LTB; Infinite mana creatures you control can produce; Infinite storm count; Infinite untap of creatures; Infinite untap of creatures you control
View on Commander Spellbook ↗
Intruder AlarmDeeproot Pilgrimage
Infinite ETB; Infinite creature tokens; Infinite untap of creatures; Infinite mana creatures you control can produce; Infinite instances of the tapped creature's ability; Infinite untap of creatures you control
View on Commander Spellbook ↗Price Context
Current price
$4.36 cheap tier
At $4.36, Intruder Alarm sits in the cheap tier for a card that shows up as a core piece in multiple infinite-combo archetypes. The price reflects genuine demand without the spike that hits true staples — it's an easy include that won't strain a budget.
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Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.