U/R Prowess
A Standard deck, by Billy Klopf
4th place at a tournament in Cincinnati, Ohio, United States on 2017-07-16

Maindeck:
5 Island
8 Mountain

Creatures
4 Soul-Scar Mage (Not currently legal in Standard)
4 Stormchaser Mage (Not currently legal in Standard)

Enchantments
4 Fevered Visions (Not currently legal in Standard)
4 Riddleform (Not currently legal in Standard)

Instants
2 Abrade (Not currently legal in Standard)
4 Shock (Not currently legal in Standard)
2 Unsummon (Not currently legal in Standard)

Legendary Planeswalkers
3 Chandra, Torch of Defiance (Not currently legal in Standard)

Sorceries
4 Crash Through (Not currently legal in Standard)
4 Incendiary Flow (Not currently legal in Standard)
2 Insult (Not currently legal in Standard)

Lands
2 Highland Lake (Not currently legal in Standard)
4 Spirebluff Canal (Not currently legal in Standard)
4 Wandering Fumarole (Not currently legal in Standard)

Sideboard:
2 Dispel (Not currently legal in Standard)
1 Jace's Defeat (Not currently legal in Standard)
2 Magma Spray (Not currently legal in Standard)
2 Negate
2 Refuse (Not currently legal in Standard)
2 Baral's Expertise (Not currently legal in Standard)
1 By Force (Not currently legal in Standard)
3 Sweltering Suns (Not currently legal in Standard)