I understand that PTR is temporary, but for the sake of development I believe it would be necessary to either nerf (in the form of cast time, increased cooldown to 20 minutes, etc) or remove magic dust from the PTR vendor. The game is nearly unplayable and although the other additions are welcome, I believe multiple (if not vast majority) of players spamming magic dust on cooldown takes away from the game.
Probably should post this on the PTR forums then