Does Kat own Swain or is it the other way around?

Well Swain has no hard CC and Kat has healing debuff, but whatcha gun do w/ blue buff swain

Isnt his W hard CC?

Skill matchup probably

Its very tough with Kat facing against Swain or Malz

my last ranked game swain was beating kat, though she said she was lagging so idk.

Swain can be tanky as hell or so I've heard.

Kat is countered by high hp or so right?

Kat has a hard time as she has to all in on swain or he just heals up and kills her from range. If she can avoid his snare so he can't just combo her and walk away she does a bit better. But she HAS to kill him when she commits with ult or swain wins every trade.

swain ****s on her so bad early, but if you make poor decisions she will snowball anyway. Make no mistakes and there is no way kat can win imo. (ps i threw my last swain game against kat by making poor decisions LOL)

Swain beats Kat, just like almost every other mage does :/
Kat can never really trade with him, he can pretty much always trade with her. She shouldn't be getting much farm in that lane.