Title:
土符｢トリリトンシェイク｣

Earth Sign "Trilithon Shake"
but she's not the right character and it doesn't look like a spellcard here.

Eh, I see floating rocks and her casting. Not a very good portrayal, I think, but still a spellcard.

This is on a pool in Pixiv where they're making these images for a TCG, from what I could gather.

I just found it interesting that Koakuma has a picture in there. And I still don't think there is enough badass Koakuma pictures. I think we'll never have enough really...

two of the rocks look like knives...