I've been crushing the Artisan format with this:
Deck
4 Chandra, Novice Pyromancer (M20) 128
23 Mountain (ANA) 64
4 Scorch Spitter (M20) 159
4 Lavakin Brawler (M20) 147
4 Scampering Scorcher (M20) 158
4 Chandra's Embercat (M20) 129
4 Fire Urchin (GRN) 101
2 Heraldic Banner (ELD) 222
4 Chandra's Triumph (WAR) 121
4 Shock (M20) 160
3 Skewer the Critics (RNA) 115
Got my 5 wins in 7 games, plus the deck has a winning percentage of at least 7/10 beyond that. I've only lost to bad draws and won games I really shouldn't have.