User blog comment:Mineko Charat Lucky/Your Champion Abilities Now Refresh on Kills and Assists Like Katarina/@comment-122.106.178.132-20130220005517

Assuming it is exactly the same as Katarina's passive (all abilities have their cooldown reduced by 15 seconds upon a kill, and this number is halved when it is an assist), I would go with any brusier/ad caster who relies on their abilities to deal damage (Pantheon, Darius, Renekton and others). As for AP casters, Brand, LeBlanc, Malzahar, Ahri and Akali for some casters.