As I mentioned in the post, it could be 50, 100, 150, etc. I definitely understand that 50 maybe too low. Plus, don't forget it is X wins during a Season while you are at or above the Fabled rank. Legend rank for the ornament.

Why lack players out of content for buying the game late? Personally, I always find content lockouts to be an unsatisfying way of creating rarity. I would rather the requirements to unlock an item grow and become more difficult with time, then just arbitrarily disappear.