u/aTi_NTC

I am an occasional Teemo enjoyer, and i recently learned wathcing an LS video, that if you have too much attack speed, your E doesn't have time to tick and apply damage because you reapply the effect with each auto. And i used to build AS sometimes because i thought it stacked, and the more I applied it the more damage it caused.

Yesterday i played a game, where the enemy team had Illaoi, Seraphine and Rengar (lot's of healing), and i noticed post game, that 4 of us built anti-heal (in game i did not pay attention, just saw healing which equaled me building anti heal). So a question poped in my head, that was it actually necessary for the four of us to build anti heal? Does grievous wound stack, so they have less healing the more anti heal we have? Or did each of us just reapply unnecessarily?

So what effects stack (if any) and what effects reapply, that's good to keep in mind?