ChessVariant: If 3 exists, then why not abolsih 2 altogether? Why choose a piece if it can change in that same move by chance? Why not just leave it to chance in the first place?
Also, if pawns can't be on the 8th row, why not simply state that a piece in the 8th row cannot be converted into a pawn? Why complicate everything talking about promotions if the piece simply can't remain in that state?

Anyway, this variant seems awfly confusing to me. It's even worse than Behemoth or Dice Chess, when it comes to leaving things to chance... You can hardly plan anything because you never know what your pieces will turn into.
I may change my mind after playing it a few times but, for now, I hope it gets tested by a few players before getting implemented here...