What Will Be the Optimal Keystone for a DOT Mage?
For mages who traditionally took DFT, what will now be the optimal keystone? I'm talking about Malzahar, Rumble, Swain, Teemo (AP not on hit), Brand, and Cass.
While Swain, Brand, and Cass might be able to land a comet pre-6 (albeit on unreliable stuns/snares/grounding), champs without significant CC early such as Malz, Rumble, and Teemo seem to be kind of lacking.
Specifically, I'm looking for runes/keystone which would benefit from their DoT abilities and/or amplify their damage in a reliable and optimal way.