Was wondering if anyone would know if the rotating game modes like ultimate spellbook share your normals mmr. Say I have like Masters normals MMR would I be paired will similar players in the rotating game mode or will I it place me with new players who haven't played the game mode. and raise my matchmaking the more I win? Thanks if you can help me out!
Sort of.
If you've never played the mode before, it will seed an initial MMR based on your existing normals MMR, but it's allowed to drift after that.
When the mode was first released, this configuration was missing. But that was corrected and reseeded even for folks that did play in that window. That first weekend last year though was rough.
But, if your ranked and normals has drifted, the system doesn't detect / handle that well. So, you can sometimes get folks who have climbed significantly on Ranked, but that never got reflected in their initial UltBook seeding. Fortunately, currently, that drift seems to be a fairly low percent.