I really like the claws, I'd keep them with me every run at purple if I could but a great run with revenant means I don't need the claws anymore and I'd rather a purple rank passive take its place
it also doesn't help that on average I get 0-1 purple stone because a shifting earth event removed one of the two mines and that most erg runs skip mines to open as many evergaols as possible on day 1

I revive with my summons and ult so the extra revive speed is not as necessary for me