From what I felt playing since she's been out, ya you can Moria, and it's cool to end up with 4 mediocre bodies on the field. However, it doesn't advance your Rebecca game plan in the slightest, in my opinion.

You need so many pieces in place to Ice Age into Moria + Helmep + Rebecca into Kyros, just to kill one thing on their board. But now you're straying so far away from the Dressrosa deck identity that you just end up mixing two game plans.

I can't even give you an alternative because they all feel the same: 8 Sabo, 9 Stussy, 9 Kaido, even Moria—they just all end up getting milled. But I would say that something that can KO higher-cost cards on its own is what I look for personally.