Turns out I'd managed to save up enough tix to sell off my Storm deck to buy into this. Regardless of people's opinions on how UWR is just the best way to play Blue control in modern, there's no denying Cruel Ultimatum is definitely what Sphinx's Revelation wants to be when it grows up.
Creatures:
2 Snapcaster Mage
2 Mulldrifter
Instants:
4 Lightning Bolt
2 Spell Snare
4 Mana Leak
2 Think Twice
2 Terminate
1 Desperate Ravings
1 Go for the Throat
4 Electrolyze
3 Cryptic Command
1 Consume the Meek
Sorceries:
4 Inquisition of Kozilek
2 Cruel Ultimatum
Lands:
1 Temple of Deceit
1 Dragonskull Summit
2 Sunken Ruins
2 Watery Grave
3 Drowned Catacomb
2 Lavaclaw Reaches
2 Creeping Tar Pit
1 Blackcleave Cliffs
2 Steam Vents
2 Arid Mesa
2 Marsh Flats
1 Blood Crypt
1 Darkslick Shores
2 Island
1 Mountain
1 Swamp
Sideboard:
1 Teferi, Mage of Zhalfir
2 Counterflux
1 Curse of Death's Hold
2 Pyroclasm
2 Countersquall
1 Jace Beleren
2 Sowing Salt
1 Shatterstorm
2 Rakdos Charm
1 Pithing Needle
Creatures:
2 Snapcaster Mage
2 Mulldrifter
Instants:
4 Lightning Bolt
2 Spell Snare
4 Mana Leak
2 Think Twice
2 Terminate
1 Desperate Ravings
1 Go for the Throat
4 Electrolyze
3 Cryptic Command
1 Consume the Meek
Sorceries:
4 Inquisition of Kozilek
2 Cruel Ultimatum
Lands:
1 Temple of Deceit
1 Dragonskull Summit
2 Sunken Ruins
2 Watery Grave
3 Drowned Catacomb
2 Lavaclaw Reaches
2 Creeping Tar Pit
1 Blackcleave Cliffs
2 Steam Vents
2 Arid Mesa
2 Marsh Flats
1 Blood Crypt
1 Darkslick Shores
2 Island
1 Mountain
1 Swamp
Sideboard:
1 Teferi, Mage of Zhalfir
2 Counterflux
1 Curse of Death's Hold
2 Pyroclasm
2 Countersquall
1 Jace Beleren
2 Sowing Salt
1 Shatterstorm
2 Rakdos Charm
1 Pithing Needle