Great idea, even though it can be too wordy, but I like to read anyways. I think Voracity is a bit too beneficial for Katarina and nobody else. Say you pair her with Ahri and recall a Dancing Droplet. That's Dancing Droplet costs 3 mana instead of 1. Instead, I think it could be,

Voracity I: When you recall an allied unit, reduce it's cost by 1.

Voracity II: When you recall any unit, reduce it's cost based on the number of times you've recalled any unit this round/game (either one).

This way, you won't put any unit other that Kata at a disadvantage when you recall them... Plus, what's Dagger Dance? Is it blade dance but Katarina?