Here are the materials in Cayuga Indian Nation of New York v. Seneca County, New York:
Lower court materials here.
Here are the relevant materials in In re Coughlin (D. Mass. Bkrcy.):
Here are the briefs relevant to the sovereign immunity issue in Deschutes River Alliance v. Portland General Electric Company:
And here are the lower court materials in Deschutes River Alliance v. Portland General Electric Company (D. Or.):
Here is the order in Sipp v. Buffalo Thunder Inc.:
The question certified:
[W]hether the Indian Gaming Regulatory Act (IGRA), 25 U.S.C. §§ 2701-2721 (2018), permits tribes and states to contract in Tribal-State Class III Gaming Compacts to shift jurisdiction over certain matters to state courts.
Here are the materials so far in MGM Resorts Global Development LLC v. Dept. of Interior (D.D.C.):
We posted the complaint here.