If you want to encourage your players to draft multicolored decks, your Cube needs some duals
Having just said that, we are keen to develop a major artifact theme with this deck at it's base - we would want to consider both Tezzeret the Seeker and Tezzeret, Agent of Bolas in this mix along with similarily themed card choices
Heck, you can drop most of the tricks and just go for a full-out Sultai Counter deck, merging the -1/-1 Counter tricks of Hapatra, Vizier of Poisons with the +1/+1 Counter power of Pir, Imaginative Rascal & Toothy, Imaginary Friend
You need to evaluate when healing is worth it versus drawing more threats
For instance, because Edeas first trigger occurs at the beginning of combat, cards that grant you additional combat phases are perfect additions