Please don't Rework Swain
At least not the way you're doing it right now.
Moving his ult onto his passive is a bad move, his ult was a defining characteristic. You changed his ultimate as well after moving it onto his passive. Becoming invulnerable and healing after going under 15% health, tell me how this is different at all from Lissandra's ultimate or Volibear's passive?
If you rework Swain, you're taking away everything that was unique about him as a champion. He's fine as he is now, I really don't understand why you're reworking him. He's in a good spot, just not played that often. Swain is an AOE DOT mage, and you're changing that whole gameplay style for what? To make him look cooler or whatever? To make him "Balanced" or "In the meta?" There are like 50+ Other champions that aren't in the meta and are not in a good spot as swain is.
There's no reason for this rework