Yeah, that's right, for the first two rounds (beating me and my very experienced friend Sami) my girlfriend played with only ten plains– accidently. It should not have worked, but she won and even got to turn Figure of Destiny into an 8/8. She also got a bit lucky with the matchups, but nonetheless, did very well.
That's funny, but especially if you have more permissive mulligan rules that's not that wild. Especially since she was playing 25 nonlands, for a 35 card deck, which has much less variance. Optimal land count for a 35-card deck with a free mulligan is probably 11 or 12 (and just because this deck has top end and manasinks).
The deck wasn't even perfect (no anthem effect and an unnecessary Soul Warden), yet it is the second win of mono white in four drafts with 4+ people this year. I'll keep an eye on wether it is a little too good.
Hard to imagine this becoming oppressive if people are willing to go for it to chase win rate, as splitting the archetype is perfectly possible (maybe branching into Wx aggro variants) and not too risky. It might be a case of your cube being a slow meta, such that other decks either are incentivized to optimize for that meta (but sort of let go of the aggro matchup because it's only one deck in the table). It could also just be that your players don't like aggro so it's always open, in which case it might make sense to weaken it a bit
My less experienced buddy Tobi is still on his trial run, playing around with all the different themes and archetypes that are outside his red-white comfort zone. Besides his severe lack of removal, the list looks pretty good (he had a Toggo in the sideboard which he should've played). However, what you can't see: Before the draft we ate together and he made the mistake, to tell everyone what he was going to draft – lead to a bunch of weird moments before and in the draft lol.
He also said, that he was a little overwhelmed with it in game, but I guess that was mostly because he had never played with most of the cards in his deck before.
I think the biggest issue with this deck is that it's an "artifacts" deck, but it isn't an "artifacts control" or "artifacts combo" or "artifacts aggro". The one-drops are aggro, but then you don't have enough density and run out of fuel with Mindslaver in hand, and a bunch of Talismans in play ramping into not much. It could be valuable to add some higher power 7-drop to support a deck like this than Meteor Golem, or maybe focusing artifacts a bit more into a fast, a midrange, or a slow archetype.