How do you say Our Lord Reigns in Latin?

A few ways off of the top of my head:

Using a genitive and a gerund: masculine: Nactus (gratia/causa) regnandi

feminine: Nacta (gratia/causa) regnandi

ablative absolute: Nacto (feminine: Nacta) regnando

using the subjunctive: Nactus (feminine:nacta) est ut regnet

It really depends on how you're using it. Feel free to message me with more specifics on how you intend to use it.