Davriel

Main Combo win is Griselbrand / The One Ring + Sheoldred, the Apocalpyse / Davriel + Vito, Thorn of the Dusk Rose

First Alternate win Combo is Davriel + A-Acererak the Archlich / Ominous Traveler
Second Alternate win is Ramp + Breach the Multiverse / Ulamog, the Ceaseless Hunger / Emrakul, the Promised End

Lots of ramp, value cards, tutors, planeswalkers, and removal spells to thwart opposing threats and add consistency to the deck