The reprint or maybe an upgrade of Outpost Siege in the form of Vance’s Blasting Cannons got me thinking of its uses not only in Ramunap Red but also in a Blue Red (mostly) Spells deck. The build goes on a pseudo-Burn route with Blue for cheap card draws like Opt and Chart a Course. The low curve is prioritized for a higher chance of transforming Vance’s Blasting Cannons.

Here below is the first version of the U/R Blasting Cannons deck:

Creatures
3 Bloodwater Entity
1 Angrath’s Marauders
3 Glorybringer

Spells
2 Abrade
2 Chart a Course
4 Lightning Strike
2 Open Fire
4 Opt
4 Repeating Barrage
1 Glimmer of Genius
4 Vance’s Blasting Cannons
2 Magma Spray
4 Shock

Lands
4 Highland Lake
4 Spirebluff Canal
2 Sheltered Thicket
2 Fetid Pools
4 Ramunap Ruins
2 Sunscorched Desert
2 Mountain
4 Island