Kalista's (annoying) interaction with Relic Shield
Kalista's passive on Sentinal is very... painful for her supports who want to use a Relic Shield. It also seems an odd balance factor, that she has the only passive of the allied proc nature that is a kill secured for her, and not just attributed to the ally. Usually, it is either only self possible procing (Lux, Gnar, Diana) or allied proc (Leona), and regardless it only goes to the person who procced it.
If nothing else, check for Relic Shield charges on the champion proccing her W before giving her the kill credit on minions, as this is very hard to not last hit it with her passive on it. We know she will get some nerfs, would be a nice compensation "buff" to go with the skill at least to her supports.