If UB control is a thing, then why not Sultai or Grixis? UB is going to be strong anyhow, with the addition of [scryfall]Crux of Fate[/scryfall], and it can help here as well.

Not much explanation here, just lists.

Sultai Control

What does green really bring into the equation? Ramp and [scryfall]Villanous Wealth[/scryfall].

[deck]
[creatures]
4 Sylvan Caryatid
4 Satyr Wayfinder
[/creatures]
[spells]
4 Crux of Fate
3 Villanous Wealth
2 Negate
4 Dig Through Time
4 Hero’s Downfall
4 Divination
2 Dissolve
1 Kiora, the Crashing Wave
1 Ugin, the Spirit Dragon
[/spells]
[land]
4 Opulent Palace
4 Temple of Mystery
4 Temple of Deceit
4 Temple of Malady
4 Polluted Delta
2 Island
2 Swamp
2 Llanowar Wastes
1 Yawimaya Coast
[/land]
[/deck]

Grixis Control

There’s also a chance we can make the decision on [scryfall]Crux of Fate[/scryfall] work for us. Especially with [scryfall]Silumgar, the Drifting Death[/scryfall]. Also, one [scryfall]Golaghan, the Storm’s Fury[/scryfall] just because Silumgar is legendary and this deck wants to go long.

[deck]
[creatures]
4 Stormbreath Dragon
2 Silumgar, the Drifting Death
1 Golaghan, the Storm’s Fury
1 Keranos, God of Storms
[/creature]
[spells]
4 Crux of Fate
2 Drown in Sorrow
1 Ugin, the Spirit Dragon
1 Kiora, the Crashing Wave
4 Negate
4 Dig Through Time
4 Hero’s Downfall
3 Divination
2 Disdainful Stroke
[/spells]
[land]
4 Polluted Delta
4 Bloodstained Mire
4 Temple of Malice
4 Temple of Deceit
4 Temple of Epiphany
3 Swamp
2 Island
2 Mountain
[/land]
[/deck]