London Mulligan Coming to MTGO

4-1 in my first league with 0 powders in Dredge. No mulligans to oblivion thanks to this rule. Deck feels much smoother in top deck mode without the powders, and more design space to tailor against the meta.

a heads up to everyone, but on Rich's stream it was discovered that this mulligan change has broken serum powder. if you powder 7 you can also powder the next 7 even if that second 7 doesn't have a powder in it. MTGO is quality software that is well tested.

last edited by BlindTherapy


Tested this in the practice room and its worse than that. You can powder as many 7s as you want if you open with a powder.

@vaughnbros Ooh. What did you replace them with? 👀

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Leylines for now in anticipation of the mirror.

Tried playing Shops with the new rule, and honestly didn't feel much better. Often was bottoming cards that I wanted in my hand, and felt like I still lost a number of games due to mulliganing.

@thecravenone said in London Mulligan Coming to MTGO:

A week before the only Legacy GP of the year, they're going to configure MTGO to play by a different set of rules than real magic. Fucking awesome.

Well at least paper magic and MTGO don't share a B&R list since they are so different.

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5-0 with PO on stream.

The deck has to be rebuilt from the current versions but I think it's much stronger with the London mulligan rule. I played a virtual mirror in the undefeated bracket.

Sylvan PO did win the first challenge. Sylvan library is one of the cards that can be exploited with the new mulligan rule as it lets you recoup the card disadvantage from mulliganing more aggressively. Overall, not much change in established lists in the first challenge with the new rule.

10-0. Got another Trophy on stream. Cut Mentor from the list. It was too slow...🤷

I also ran a twitter poll of the London mulligan as I was curious what people's opinions were (and also wanted to see how perspectives change over time). Sample size is small but it seems the majority of people are still formulating an opinion (which is great as I'm glad people are starting out openminded - and those who had an opinion are probably those that had already played several leagues on MTGO with the new rule active). I plan on repeating the poll this weekend.


Started another Twitter poll if people want to chime in.


I'm not on Twitter so I'll chime in here. In the abstract I like the London mulligan a lot. It feels much better especially when you get two bad openers in a row, and the experience of using it really won me over. Taking the same decks from a few weeks ago and applying the new mulligan rule to them just makes games more pleasant, on average.

Which is why I'm so glad that you were able to demonstrate what happens when people don't play the decks from a few weeks ago. The key point in the Sam Stoddard article about this mulligan rule was that it influenced deck design, and wow is that ever borne out by your Outcome list's evolution. I think that's about as clear an illustration as possible that the London rule is ill-suited for Vintage, if the goal is simply to reduce the frequency of mana-screw without substantially impacting deck design along the way.

@craw_advantage Thanks for taking the time to write up your thoughts. It's similar to what I've experienced - I didn't expect to like it, but I do. It adds more skill and consistency to typical games of Magic.

For Vintage I don't think the London mulligan is incompatible with the format, but the current restricted list is certainly not optimized for London. Vintage is by far the hardest format to fix though given the structural constraints. It's also the format least likely to affect DCI decisions.

@chubbyrain said in London Mulligan Coming to MTGO:

For Vintage I don't think the London mulligan is incompatible with the format, but the current restricted list is certainly not optimized for London.

Something that occurred to me after I posted is that I assigned a certain negative value to "influences deck design" because it was treated as a negative in the original Stoddard article, but that's not really fair--any mulligan rule would influence deck design, including the presence or absence of a mulligan in the first place, and we don't need to anchor our reaction to London to the idea that the deckbuilding trends encouraged by Vancouver are ideal. It occurs to me that there might be some other neat possibilities opened up as well--if mulligans can be an intentional part of your gameplan in combo, can they be part of your gameplan in aggro? Midrange? Could this be Sphinx of Foresight's time to shine at last? So I guess I'm coming around after all, provided that we can also get the appropriate DCI action to go along with it (which unfortunately isn't a given).

The biggest thing for me is that the whole myth/fear of Dredge/Combo taking over the format seems to be debuffed to me by these last couple weeks. People haven't really added so many anti-combo / anti-dredge cards to their main decks to even make that happen either.

While MTGO shifts much more frequently than paper, it doesn't change that quickly. That said, there is a trend to more Bazaar decks and fewer Blue control and Shops decks.

Week before the London:
Bazaars: 6
Gush: 7
Paradoxical: 7
Shops: 9

Last week:

What metrics are we using? If Bazaar becomes 1/3rd of the metagame, is that taking over? Do people really have to run main deck hate for it to be a healthy metagame (I was beat by MD Relic of Progenitus out of PO the one league I played with Dredge)? What about PO? I really think a 3 week trial is insufficient to gauge the actual metagame effects of London. This was probably a PR move to expose players to the rule change and give them a chance to experience the mulligan rather than have the MC be their only interaction with it.


Small samples are sufficient for telling you significance if there is a dramatic change. There isn't a dramatic change. Based on your numbers:
Number of outcome decks in top 32 is equal
Bazaars are slightly up
Shops are slightly down
Control/Gush is slightly down
Others are roughly the same

If Bazaar was that dominant now, I'd more expect to see it winning the tournament and getting more representation in the top 8. Only 2/10 in the top 32 made it to the top 8 (expected value would be 2.5/10).

Sure. I agree there's been no dramatic change. I think we can conclude that whenever something happens, at least a few people will have a tendency to overreact, whether honestly or out of hyperbole. There's certainly a large enough sample size of MTG history to conclude that. 🙂

This test period just feels really weird to me. Like, I don't know what to do from a brewing perspective as I don't want to invest more time for one more week of a rule that might not be implemented. I guess for a Modern MC the incentive is there but for Vintage, I had one idea, it worked out, and I kind of feel set for this 3 week block. And the new set comes out on Thursday, and then there are 6 days with London, and I'm unsure how much I want to build around London with the new set...

It really feels that we've just scraped the tip of the London iceberg, honestly.

last edited by Guest


I've also been playing a lot of Outcome Storm. It feels very nice with the new mulligan rule. A few 4-1's in the leagues.

I'll start my post be saying that my opinion on the London Mulligan is not firm. It's a complex topic and relevant data are limited. Three weeks really isn't enough to gather sufficient data to make statistical comparisons (at least with the limited data that our benevolent overlords permit us to see). So we're left with weaker forms of evidence (trends, intuition, etc.)

In any case, my initial reaction to the new rule is net negative.

There are certainly positive aspects of the new rule. As others have articulated here, the new rule may increase the breadth and complexity of decisions in the early game and in deck building. In theory, this should reward skill/experience and make the decision process itself more mentally stimulating and enjoyable.

However, several factors make me especially concerned about adopting the new rule.

First, I don't think we have (or will have) the data necessary to have an idea of how the new rule will affect the metagame and play experience. I recognize that taking risks can be an important part of improving the format/game, but I feel like the magnitude of this proposed change needs a commensurate amount of data to inform it, which I don't think we'll get.

Second, I worry that the new rule incentives strategies that are broken, fast, proactive, and all-in. This could make Vintage more like its caricature, the "turn-1 format." It may also make the luck of the die roll more important.

Again, hard to know for sure. The format doesn't appear to have undergone a cataclysmic shift in this direction. But I really wouldn't expect it to happen that fast, either. There's bound to be inertia in the decisions people make--people like what they play, have emotional attachments to certain cards/decks, and don't necessarily have the time/motivation to find out how to capitalize on the new changes.

Of course, such an issue could be mitigated through restrictions. But we all know how long addressing format issues through restrictions can take. I'm worried about Vintage undergoing such a large upheaval and how long it will take things to settle.

Finally, I worry that the new rule could complicate our long history of knowledge and theories regarding deck building and in-play decisions. Honestly, I have not thought this one through as deeply, but I don't think I've seen that discussed elsewhere (but I haven't read much on the new rule, either, so I could absolutely be wrong here).

Again, my post is intentionally full of "coulds," "mays," and "appears." I really feel like I don't have a firm grasp on this. Looking forward to reading more discourse on the subject.

last edited by Zias
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