Kalista's Soul Bound - Visual Bond
I think the very obvious bond of light between Kalista and her Soul Bound ally may detract from certain tactical choices that her kit offers; For instance, most of the time, opponents will expect her to be bound to the supporter. Should this very obvious bond not be there, they immediately know that they have a mild edge because she's not operating at full capacity; furthermore, should you as a Kalista player want to bind with the jungler for some interesting gank potentials, your opponents, again, will suspect this as they will notice when she's not bound to the support and will suspect that she's obviously bound to someone near enough for her to pull in close when the time arises. This glowy bond, while pretty, can leave her in a position with some very obvious gaps in strategy. I would suggest making the bond only visible to ally characters, or just remove the visual altogether if enemies can see it.