I finished 4th with this (unpowered!) list:

4x Plateau
4x Bloodstained Mire
1x Wooded Foothills
2x Wasteland
1x Stripmine
1x Lotus Petal
7x Mountain
4x Goblin Lackey
4xGoblin Warchief
4x Goblin Piledriver
2x Mogg Fanatic
3xGoblin Vandal
2x Siege-Gang Commander
2x Goblin Welder
4x Swords to Plowshares
3x Null Rod
2x Red elemental Blast
2x Goblin Grenade
4x Lightning Bolt
2x Shattering Spree
2x Tormod’s Crypt

Sideboard

1x Ghostly Prison
2x Shattering Spree
2x Pyroblast
2x Red elemental blast
1x Goblin Sharpshooter
2x Disenchant
3x Rule of Law
1x Goblin Vandal
1x Goblin Welder