Looking for two subs in Priori
 

Ulm and C'tis.

Late game, around Turn 66.

Both nations are in strong positions.
C'tis is a strong contender for second. Winning a war with Machaka. Artifacts, SCs, all the endgame goodies to play with.

Ulm has been at peace for most of the game. The player has vanished, so no one knows quite what he has, but I have seen Tartartians, so he's managed to diversify. You'll likely be able to surprise everyone.