Attn Riot, please try to play Karthus vs Kalista
Please try to play Karthus vs Kalista, or GP vs Kalista to see how hard it is for a immobile mage with delays on his q or a melee champ to even deal damage on Kalista.
Kalista makes these 2 champs look old and useless. Even if she had 400 range the same thing would happen. Kalista needs her dash toned down. Karthus needs more ms and a faster AA. GP could be either tankier, or faster.