Kalista W [Sentinel]
A suggestion for Kalista would be to let her attack her own Sentinels, but their health is greatly reduced, so it's a one hit kill from any source. Allowing her to use her Sentinels to be attacked by perhaps anyone, would allow a quick lifesteal for teammates, or to block skillshots, etc. The main point would to let her use her passive for her to get away better/faster.