616-Wakanda vs Lexcorp.
This is a scenario match. Whatever their current status in the comics (no idea, lol, sometimes they get trashed), both sides are raised to their default levels of power, wealth, and technology.
T'Challa is King of Wakanda. He has his standard Black Panther powers, but no "Lord of the Dead" stuff going on. Vibranium is an absolute go, however, as this is default Wakanda.
Lex Luthor is CEO of Lexcorp. This is default Luthor with his 9th/10th-level effector mind (or whatever level it is, basically, the smartest human being in the DC universe, or so I gather).
Both sides get supplied with a dozen gates, high-tech devices that can open up portals to the other Earth. The gates can be reverse-engineerred to build more gates.
* If this is a stomp for Lexcorp, give T'Challa his Lord of the Dead powers.