Lots. Anything involving standing at the least, but also many of the “unauthorized people changed the rules without the authority of the state legislature”.

https://election-integrity.info/2020_Election_Cases.htm

You’ll find similar lists on Wikipedia and at the American Bar Association; they slant their interpretations differently than I do here. Look into a couple of the “standing” or “no merit” cases and see if you really think they were without merit or that there was no “case or controversy” as defined in the Constitution.

Yes, a couple were kooky, particularly around voting machines, but most were “you changed the rules in a way that weakens election security and you are not Constitutionally allowed to do that, since you aren’t the state legislature and the written law is at odds with your rules”.