Currently in Platinum, having finished Rank 1 of my Plat division in S1, promoted to Diamond in S2, fell to Platinum in S3, returned to Diamond in S4, and crashed back to Plat last second in S5. I think I'm a good predictor but then again I would think that.
The market resolves YES if in seasons 7-13, I am in Masters League for any of those seasons. If there exists a league above Masters at any point and I am promoted directly into it, the market resolves YES, even if I at no point am actually in literal Masters League. It resolves NO otherwise at the start of S13, which is likely May of 2024.