I really like this deck. With Oath, do you think Kozilek, the Great Distortion could replace Void Winnower? Maybe Sphinx of the Final Word has a place?

What is your sideboard advice? I think the deck struggles a little over control that can counter certain combo pieces..

Also note that Hedonist's Trove is from dragons of tarkir and will not rotate for a while.

Hedonist's trove only lets you play whats exiled by it. Late game mills from tutelage makes it viable as a 1 of but i think drawing a board wipe or a combo piece will be better. Honestly I think Crux of Fate would be better. Maybe Transgress the Mind. Crux kills everything except Ulamog. So you'd be in the clear to smash face. Transgress can eliminate problematic 3+ turn drops for cheap.

With a mechanic like delve hanging around. I see the control matchup being very sketchy. Hand disruption, countermagic, a good early game, and thoughtful play are key in that matchup. You're set for the late game, but so are they. I see control winning a lot even if you're milling them. Dig is just too strong against you. You may need Negate and/or Duress for that kind of matchup

Main board is two cards over (actually 62 cards). Also, with the rotation, what would u replace for the altar of the brood and the tomb of the spirit dragon?