First off these champs would be full build and level 18 so you can get the very best out of them. I mean if the Teemo took his time it would be an easy win but a quick fight cass would definitely win. So who do you think would win? Annoying teemo or the slither.io?
Tbh depends on the build and the skill of the players but Cass has the upper hand. As a teemo this is one of the champs i hate to play against. Snakes eat yordles
If Cass hits ult but doesn't even stun, she will STILL win hands down. That Twin Fang be broken.
based on laning phase, Teemo would have a hard time, so unless Cassio was stupid enough to step on shrooms all the time or unless Teemo build tanky with full MR, I think Cassio would win.
for teemo and he might win a straight 1v1. any other build will lose unless the teemo went for full ap burst and ambushed cassiopeia with no room to fight back.
If you're talking late game with full build like you indicated and cass actually lands her stuff, Teemo would be screwed there's no way for him to deal with a 3500 health champ chunking you for 1500+ health per second
