Here are the materials so far in MGM Resorts Global Development LLC v. Dept. of Interior (D.D.C.):
24-1 State & Tribal Sovereigns Motion to Intervene
27 MGM Response to Motion to Dismiss
33 Reply in Support of Motion to Dismiss
34 MGM Opposition to Motion to Intervene
36 Reply in Support of Motion to Intervene
38 DCT Order Granting Motion to Intervene
We posted the complaint here.