Mountis Format is a rotating, common charity, format designed to let you use all the various common cards that are too weak for competitive play at regular yugioh but have interesting designs, like the formats namesake Asset Mountis.
The gist is the only legal cards in Mountis are the common cards released in the past 3-6 sets (see the section on Rotation for more), leaving you with a pool of weaker cards, creating interesting deck building challenges.
It’s cheap. All the cards are recently printed commons so if you’ve been opening packs it’s likely you have most of the cards already, if not their probably pennies on the secondary market.
Mountis Format is weaker than regular yugioh, there’s only a small list of rather hard to access ED Negates and removal cards. Similarly, the access to hand traps is greatly lessened, with us currently having only D.D. Crow, Droll and Lock Bird, and Ghost Ogre so far. Still it’s not Edison or Goat, it’s got modern cards like Redoer, Pankratops and the Dragon Rulers, creating it's own unique variant on Yugioh
In Paul of Team APS’s recent twitter monolouge, he complained about there being a lot of cool cards with not a lot of sue in competitive play, here you get to use them. The lack of all powerful extra deck options leave cards like Kuibelt the Blade Dragon and Gaia Blaze, Force of the Sun legitimate options. Alongside that the variable boatload of insect stuff might make Asset Mountis or even Newbee playable.
The formats rotating nature, alongside the constant influx of new cards from new sets means it’ll basically always be shifting alongside mainline yugioh.
Rotation is a bit of a touchy subject in the Yugioh community, for good reason, it’s a deeply problematic aspect of many games, but I’ve decided to implement it here for the following reasons.
Rotation can very easily devalue collections of collectors and it limits you from using the cards from mainline Yugioh. To make matters worse, they require constant expensive maintenance to play in the game. However with all the cards legal being common anyways they’re not picking much value up anyways and them being cheap means you can afford it much easier than rotation in paper, making this sting much less. Besides I’d imagine most Mountis games would be played online :p
Common Charity, Mountis’s closest relative has been defined by the large list of what’s fallen to common over the years. Mountis’s rotating banlist keeps the focus on the recent pack filler commons the format is based around.
This alongside the common charity clause keeps the pool limited, with a smaller card pool weaker cards bubble to the surface, like how in lower tier formats of smogon weaker pokemon find their niches. Mountis format is all about weaker cards finding niches, so the smaller card pool helps a ton with that.
If the main Yugioh Advanced format began rotating that would be bad, it would remove 99% of the card pool and history of the game in competitive, it would be a cowardly capitulation to MtG, and it likely wouldn’t even help with power creep that much. But in a format that’s largely fan supported/made it can be used as a tool to limit the card pool and make decisions more interesting.
Mountis handles Rotation in cycles of 3. Each Main Set (LODE, INFO, ROTA, SUDA, erc) is placed into a bundle of 3. The current bundle of 3 is Legacy of Destruction, The Infinite Forbidden and Rage of the Abyss. Supreme Darkness will hail in the creation of a new bundle, but the previous bundle won’t rotate out, not until it’s bundle of 3 is completed, leading to six main sets in the format, in our case Duelist Alliance. Once there are six sets in a Rotation it is considered a Complete Format. However, at the next side set release, the previous bundle is rotated out and the format starts fresh.
Side sets are tied to the main set they are released afterwards, so Rarity collection 25th is tied to Legacy of Destruction, Crossover Breakers is tied to Rota, etc, etc.
To simplify things, the legal cards are all commons released from LODE onwards, sometime soon after Alliance Insight it will move to being all commons from SUDA onwards.
Cards themselves are legal according to their printed rarity, so for cases of structure decks you can’t use cards from their holos ultras, but you can use everything else as they are usually printed as commons.
Cards from speed duel are legal (if common), Skills are not
Of course, no list of legal cards would be without a list of bans, and there are a small handful or cards I'm going to preemptively ban for format health
First off Sangen Summoning, while I don’t want Tenpai completely gone (there are interesting cards like Dora Dora and Blaster I feel they’d use in interesting ways, still they are probably a bit too strong for this format and we don’t want to see any like actual 2025 meta decks running around. So Sangen gets banned, mostly because it’s the most unfair part of the deck.
For similar reasons, I am also limiting Chundra.
Alongside that, I’m also banning Card of Safe Return for various very, very obvious reasons.
And finally, I’m banning Maxx C, which due to the Speed Duel Pack, is technically a legal card in the format. This should also be pretty obvious why I’m banning it, you can use it on a full board, I want the format to feel different from Master Duel, it’s just very deeply unpopular.
Other than that, I’m trying to minimize actually using the banlist here, this is a limited format, one that uses Rotation, so theoretically that could ease some of this stiffness, at least ignoring certain recent MTG formats. Still this format is in its early stages so it would probably be better to ban more with more data. I’ll reconvene in about a month to see if anything is broken.
There is a visual list of the banlist in the discord server if that helps
Tenpai - It’s been meta since LODE and they have basically all their stuff besides their super dragon, and in a format with a lot less turn 1 interruptions, you can probably make it work. Again this is the deck I’m most hesitant on this format, I don’t want to obliterate it outright, but if it becomes a problem, I will ban it.
Superheavy Samurai - A shocking amount of their really good stuff got common reprints recently, basically everything but Wakaushi. Another deck I’m kinda hesitant on but the lack of a real good payoff might make them pretty fair.
WATER - The other deck that can probably abuse Dragite, they’ve got both Diva and Fishborg Blaster in here as well as a ton of recent support from ROTA, it’s likely fishing season will be good this year.
Ragnarika/Insect Pile - Probably the deck I’m most excited for, Insect has a ton of great cards from the formats titular from free bodies like Asset Mountis to advantage engines like Insect Invitation and Great Ballpark to interruptions like Heavy Cavalry. They’re lumped in with Ragnaraika because Ragnaraika are the most likely deck to work with these cards, which while losing their best starter in Evil Seed still have their infinitely reviving link engine alongside their interruption card Hunting Dance.
But those are just the beginning, with the Dragon Rulers, almost any deck can use their free bodies, which helps out weaker strategies, I haven’t even gotten into Six Samurai who are one of the only other decks with a real negate except Dragite, or Fiend-Decks who while mostly lacking their Advanced plays Still have Sequence, or Melodious or Light and Darkness Dragons. Point is there’s a good amount of decks available
In conclusion: Here is a link to the discord server Neocities.
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