Is Swain the best late game teamfight mage?
Assassins can't get the APC out fast now as he has massive sustain. He might not have infinite scaling but he won't die.
Assassins can't get the APC out fast now as he has massive sustain. He might not have infinite scaling but he won't die.
+
= A dead 

Azir Lux and Morg are better imo but he's quite good.
Maybe he will if they fix that last hit animation.

Ori

Cassiopeia.
He is hard countered by a common summoner spell and a very strong item that some people buy even if they don't need the passive. AND he is a DoT mage, I've lost to equally fed ADCs with some good lifesteal before.
The answer is always 
But check Swain's win rate. Currently the highest in the game....so maybe youre right. I know he snowballs out of control and can wreck your team midgame when no one has enough damage to tear through him with a RoA+Zhonyas/Spirit Visage