Court packing requires a Constitutional Amendment. No way will 3/4s of the States say yes. You also need 2/3s of the House and Senate. I doubt that the Satanists will get a 2/3s majority any time soon in either house.
Court Packing, or increasing the number of Justices does not require an amendment to the Constitution. The number of Justices is set by Congress not the Constitution.
Term limiting the Justices would require an Amendment.