So im working as well on a good CB formation and what I have found is that if your already heavy on poison dealers, Kael, Monk and Aothar. I would maybe put lifesteal and a speed with stats for survivability like def up, HP% etc. Warmaster obviously will greatly enhance this Champs physical damage but most of us are not at that level yet so it will be really important to keep the poison debuffs up on the CB so Yaga gets that 25% damage increase.