If you're going to lower Kalista's E cost to 30 mana, lower Twitch's too.

On PBE 's Rend is to cost 30 mana at all ranks. This is fine, I'm all for these Kalista changes, but is suffering from an E that serves the same function, but costs 50 to 90 mana, based on rank. He can barely afford to harass enemy champions with Expunge, much less farm with it.