Aquinas's 3rd Way?

If everything were contingent, then there might have been nothing.

If there had been nothing, then nothing would have been possible.

Necessarily, something is possible (because something is actual).

So, not everything is contingent.

So, there must be (at least one) necessary being.

Probably this isn’t Aquinas’s 3rd Way. Either way, it strikes me as a powerful argument.