You can plan a lot better when you have the Time Walk in hand and will gain a lot more from casting it than you do most times with Mastery
But you can easily build a deck that includes a bunch of both
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
For instance, because Edeas first trigger occurs at the beginning of combat, cards that grant you additional combat phases are perfect additions