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It's absolutely horrible. You do alright during the laning phase but without any damage from you, unless the Kalista horribly overextends and gets caught in a gank you have no real damage to ever really kill her.
If she plays it safe into the midgame the moment she gets a QSS you become worthless to the team.
Your wither does nothing, you have no Q stacks, you have no gold to become the tanky monster that you should be by the mid/late game.
All you have for your team then becomes withering an enemy caught out of position or if they situationally have someone that has no gap closers to engage like a Garen or something. And you can provide decent tower support with your aoe for when they are pushing it.
Basically, unless you're against bronze and silver players, don't do it.