Game Changers set your bracket Counting the Game Changers in your decklist is the quickest read on its bracket
Its second effect in the GY is miles better, as it banishes itself to attach one each of a Time Thief monster, spell, and trap from your grave to a Time Thief Xyz monster you control
While we don't have formal numbers for the English version yet, as pre-release events have only just begun and the set won't officially be released until May 30th, it's unlikely this will move any further up the list than it is, even if the specific value amount fluctuates
Some characters also have modified percentages as to what cards they can get in the hand at any point
Its strength can easily be identified in its useful removal effect and potentially high attack stat that is dependent on the number of monsters used for its summon
because Mental Notes are numbers 5-8