Maybe fireblast could become assault strobe or psychotic fury. The latter keeps you drawing more spells to pump with and additional damage to really hit home. I would even say the mortars should be replaced with fury. Fireblast and bolt both give you damage options and the overload cost is outlandish in a deck with only 20 lands.
Is Blistercoil Weird/Nivmagus Elemental good in this deck? I wanted to believe that they were, but in the long run Gelectrode/Wee Dragonauts seemed better.
Blistercoil is a good combo with quicksilver dagger. Deal damage, draw a card, make it grow and untap, cast the instant/sorcery you just drew, repeat and attack. It looks fun!
4x Nivmagus Elemental
4x Blistercore Weird
4x Kiln Fiend
4x Gelectrode
4x Wee Dragonauts
3x Fireblast
4x Vapor Snag
4x Lightning Bolt
4x Distortion Strike
2x Mizzium Mortars
4x Steam Vents
5x Island
7x Mountain
My take on Kiln Fiend combo with special consideration for what we've gained with Return to Ravnica. Any advice is appreciated.