Intruder Alarm


Format Legality
Tiny Leaders Legal
Noble Legal
Leviathan Legal
Magic Duels Legal
Canadian Highlander Legal
Vintage Legal
Modern Legal
Vanguard Legal
Legacy Legal
Archenemy Legal
Planechase Legal
1v1 Commander Legal
Duel Commander Legal
Unformat Legal
Casual Legal
Commander / EDH Legal

Printings View all

Set Rarity
Eighth Edition (8ED) Rare
Stronghold (STH) Rare

Combos Browse all

Intruder Alarm


Creatures don't untap during their controllers' untap steps.

Whenever a creature enters the battlefield, untap all creatures.

Price & Acquistion Set Price Alerts




Intruder Alarm Discussion

KIngWiggins on W: Force of Will, H: ...

1 day ago

I am looking to trade for some Force of Wills to put in my Legacy deck. I am willing to trade for any version, and any sleeve playable condition priced accordingly. I know FOW is a higher priced card so I am willing to talk out offers and find other things I have if anything listed interests you.

Some things I have for trade (some prices wrong):
Chandra, Flamecaller
Nissa, Voice of Zendikar
Mana Vault
Capture of Jingzhou (Don’t really want to trade but would work something out)
Final Judgment
Collected Company
Pact of Negation (FUT)
3x Intruder Alarm
3x Bridge from Below (FUT)
Hallowed Burial (EVE)
More random stuff in Binder and unlisted.

I also have a Savannah (LP) that I just bought from another great user that I don’t know if I will trade, but would be willing to hear offers involving Force, or other Duals.

Lastly, I am looking for Spanish Inquisition of Kozileks if anyone has any, long shot, but worth trying.

LVL_666 on Sliver Swarm

1 week ago

Hey Doombeard1984,

Sorry for not responding sooner - got busy with life and stuff. Also been working on a new deck for funsies. However, your question: would Maelstrom Nexus work as a possible value engine in your deck? In my opinion...I think you wouldn't get as much value out of the card as you would like. According to my count you have 13 cards in your deck that are CMC 5 or 6. Ideally with Maelstrom Nexus out, you'd cast one of those big cards and cast something smaller - ideally a Sliver. The problem here is that there's a bit of unpredictability with Cascade - once you cast that spell you could end up revealing and casting any of your instants or sorceries. Imagine Cascadeing into a Armageddon with no Gemhide Sliver on the board?

tl:dr - Would Maelstrom Nexus be fun to play? Yes. Would it get you consistent results with every Cascade trigger? No. Sometimes, it may even hurt you.

If you were looking for more consistent results that result in ether value, or just outright win you the game then I'd suggest:

The previously mentioned cards when paired with a Mana and Haste Sliver result in you casting everything from your deck for the most part. Sure, it doesn't exactly fit within the aggro play style you seem to be going for, but it ends the game. Most players who have played against Slivers know exactly what any of the previously mentioned cards mean when you get them on the battlefield, so expect to have to defend it when it hits the board. What do you think of my suggestions? Would you want to use any of those, or are you looking for something more unique?

rockleemyhero on cEDH Phelddagriff

1 week ago

I agree with KillDatBUG. Like you could do that combo with any general and no creatures in the 99, but you are severely limiting your ramp, and greens greatest asset in cedh are 1 mana dorks. But if you really want to build hippo, you do you. There’s some cute stuff with Intruder Alarm you could try with a creature that taps for G+ for infinite mana with phel out.

ThallionDarkshine on Ezuri Elfball

2 weeks ago

Sweet deck! I really love to see Ezuri being built as anything other than just plain goodstuff, even though that's how I'm currently running it myself. I'm a huge fan of some of the inclusions in here, including Uncage the Menagerie (I love that card), Hurricane (having a noncombat finisher is sweet), and Throne of the God-Pharaoh.

I built a much more combo-centric Ezuri elfball list a while back, and while your deck is obviously much more focused on elf synergies, I think there are some cards from my deck that could have a place in yours. Intruder Alarm is an incredibly powerful effect, letting you generate mana off of your dorks very efficiently. It's especially good in combination with Lys Alana Huntmaster and the next card I'm going to mention, untapping your board twice for every elf you play. Wirewood Hivemaster is an additional way to generate tokens off of elves you play, and while they are not elves, it can help you generate experience counters quickly. Finally, I'm not sure if you're purposely trying to avoid infinite combos (with the exception of Sage of Hours), but Temur Sabertooth is one of the most powerful cards for going infinite in an elfball deck. With haste, you can bounce your big mana elves to generate infinite mana, and once you have infinite mana, it gives you a sink for it, letting you draw your deck, generate infinite experience counters for a lethal Walking Ballista, or whatever else your heart desires. Here's my combo elfball for reference: Ezuri Elfball

JellyBelly2o on List of all infinite combos 2.0

2 weeks ago

See if you want a good combo look at the infinite mana and token mix Kiora's Follower + Intruder Alarm + Forbidden Orchard boom creates infinite mana.

Ch0ppah on The River Merfolk

2 weeks ago

I saw this deck on a deck ad and decided to try to help out, mainly because I also enjoy playing Merfolk decks and I have one GU merfolk deck using Kumena, Tyrant of Orazca that's pretty fun to play. If you want the link, it's Alexander's Terrible Horrible No Good Merfolk Deck. If you like Merfolk, Kumena is an excellent commander to try out. I personally would get rid of Pyramid of the Pantheon because for your deck it's too slow. Most of your drops are already pretty cheap, and having to wait three turns (at minimum) to get the card's full power doesn't sound too great.

I would also get rid of Leonin Sun Standard, while the buff is a good mana dump and synergizes with any unblockable effects you can slap onto your merfolk, since the buff doesn't count as a +1/+1 counter buff and isn't proliferate-able, I wouldn't run it.

Windrider Patrol is too expensive for your deck. The scry is nice, but if thsi is a UW Aggro deck, it's probably best to stick to smaller, more easily swarmable creatures.

Animation Module is too slow too. 3 mana for a semi-prolif on only one permanent as opposed to something that can proliferate on everything.

Brave the Sands doesn't really make too much sense to me in this deck. The vigilance effect and being able to block multiple things doesn't really help either since if your creatures are big enough and able to block you probably won't get swung at anyway. If anything, run Intruder Alarm instead (it's so much fun trust me).

Noble Purpose can also be taken out. The lifegain from unblockable creatures is nice, but at 5 mana I wouldn't run it.

In my opinion, Kopala, Warden of Waves sounds good in theory, but against a swarm strategy like this deck is, you can bet people will probably save their single target removal for either other players or just use non-target board wipes on you.

Sea Scryer is a merfolk, but in a (mana-wise) cheap deck like this I don't think he'll be too useful. If he's in your opening hand or shows up in the first 3 turns or so he can be useful, but if you don't draw him before then he's kind of a dead draw.

Heartstone doesn't synergize enough with your deck. There's not enough activated ability creatures in your deck to warrant running it in my opinion. There's probably more you can do to get rid of things, but I think those are good suggestions to start with. Try to assess your big cards and see if they're really worth their mana cost.

RGleason on Phenax Mill

1 month ago

I think that Intruder Alarm has a place in every Phenax deck. It's so good to be able to keep your creatures untapped and not have to worry about tapping them to mill until you know they will untap immediately so you can always have blocks up. It is also almost criminal to not be running Eater of the Dead as, depending on the decks you are playing against, it often goes close enough to infinite against opponents and mills them entirely with just the one card. I also believe that Ravenous Trap is an absolute bomb when you're playing mill against a reanimator deck.

I'm not crazy about the one off spells that just mill for a few, especially because these decks are often trying to play the long game because milling 300 cards not easily done against more aggresssive decks (ie almost every other deck ever). So for me I tend to focus less on slowly ticking away at my opponents libraries and more worried about controlling my opponents until I can combo off, and I tend to have more success with that. Especially because most people tend to not enjoy watching their deck get thrown away.

kamarupa on spamming those tokens

1 month ago

Incidentally, I just playtested this deck a few times and it starting really swinging about T7 or so. I imagine that will be close to the average, with some games needing to go as far as 13 turns and others hitting big by T5. That's not terrible, but also not "competitive." In my estimation, as it currently stands, this deck will probably win 50% in casual Modern play. Considering the pricetag, I'd say that pretty good.

Also, I noticed Thraben Doomsayer in the Maybe-board, and it made me think of my deck HUUU MAAAAN centered around that and Intruder Alarm (infinite combo, infinite tokens). Just thought you might want to look at it if you're into the idea of getting lots of tokens.

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