Here is what I have been playing to get me from Platinum to Mythic. Pretty standard fare, but thought I would share. Pretty self explanatory, but Bond is what really puts this deck ahead for me. It gives you a good toolkit mid/late game and with Enter gives you a Mill wincon.

Mythic Esper

Creature(1)
x1 God-Eternal Kefnet

Instant(7)
x2 Moment of Craving
x1 Mortify
x2 Vraska's Contempt

Sorcery(19)
x1 The Elderspell
x2 Legion's End
x4 Thought Erasure
x4 Bond of Insight
x4 Kaya's Wrath
x3 Enter the God-Eternals
x1 Command the Dreadhorde
x2 Discovery // Dispersal

Enchantment(2)
x1 Search for Azcanta
x1 Oath of Kaya

Planeswalker(7)
x4 Teferi, Time Raveler
x3 Teferi, Hero of Dominaria

Land(24)
x2 Plains
x2 Swamp
x4 Hallowed Fountain
x2 Isolated Chapel
x4 Godless Shrine
x4 Glacial Fortress
x2 Drowned Catacomb
x4 Watery Grave

You hit mythic playing BO1?!
That's very impressive