For those of you who like Mountains. Honestly, this is probably what I'd play if Regionals were tomorrow:
2x Lavaclaw Reaches
2x Terramorphic Expanse
4x Dragonskull Summit
1x Swamp
4x Arid Mesa
3x Scalding Tarn
8x Mountain
4x Goblin Guide
4x Plated Geopede
4x Hellspark Elemental
4x Hell's Thunder
1x Goblin Bushwacker
3x Zektar Shrine Expedition
4x Blightning
4x Lightning Bolt
4x Burst Lightning
4x Earthquake
Sideboard:
3x Manabarbs
4x Goblin Ruinblaster
4x Doom Blade
4x Searing Blaze
2x Lavaclaw Reaches
2x Terramorphic Expanse
4x Dragonskull Summit
1x Swamp
4x Arid Mesa
3x Scalding Tarn
8x Mountain
4x Goblin Guide
4x Plated Geopede
4x Hellspark Elemental
4x Hell's Thunder
1x Goblin Bushwacker
3x Zektar Shrine Expedition
4x Blightning
4x Lightning Bolt
4x Burst Lightning
4x Earthquake
Sideboard:
3x Manabarbs
4x Goblin Ruinblaster
4x Doom Blade
4x Searing Blaze