Depending on the rest of the Halloween cards on offer I might skip it. Nothing jumping out as a must have for me. There's precious little content I can't clear with my current roster and I'm trying to be better about my spending on this game. Halloween XM is tempting but with Anaphon, and my existing Luci/Pandora teams I don't see her pushing any boundaries for me.
Halloween Rozuel would be a nice upgrade from Aamir for a couple teams since I just don't have a decent bind clear to cover the devil type. The Prongs certainly don't hurt either.
Fake Edit: Just saw the rest of the cards. Halloween Gran is basically Sherias Roots' Zeus Dragon. My alt has a hyper Sherias Roots. FUCK. This would give me a rainbow team I enjoy playing while also keeping my alt from having to pair with my Ra Dragon. It helps that I have the ideal roots team basically hypered already. Really have to think about this. The lesser rolls aren't amazing though still useful.
Here's a rundown of the REM:
4 stars: Thoth & Sopdet, Mulan, Misery, Undine, Izanami
None of these guys get me anything I don't have better elsewhere.
5 stars: Chiyome, Parvati
Chiyome is tempting. It's a shame Parvati didn't get the Beach Lakshmi treatment. I'd be happy with Chiyome but I'm not rolling for her.
6 stars: Alraune, Vampire, Laila, Karin, Rozuel
I'd be happy with pretty much anything in this tier. Alraune's buff looks huge. Bind Clear awakening and TE make her a farm more valuable sub. Vamp getting god killer makes him a straight upgrade for dvalk in my eyes. Karin would fit nicely on Awoken Persephone. Rozuel would be the final piece in a crazy strong dark TPA team.
7 stars: Blonia
Again Awoken Persephone would love access to her as a sub but I have normal blonia so the value is lessened here
8 stars: Kali, SoniaG, Xiang Mei
The dream. I'd be happy with SoniaG or Xiang Mei, HKali doesn't do anything for me.
Realistically, I don't see me picking up a collab 8 star and the smart money would suggest I hold off since while useful I don't get much value at 4* and need to get lucky to really see any benefit to rolling in this REM.
If Anaphon wasn't looming I'd probably roll a pack in this REM hoping to enhance a couple teams. As it stands I'm not sure what I'm going to do. I'd love Gran but 8 star rates are terrible. At least they gave a decent carrot to chase for those more inclined.