Rakdos Goblins

[Roro]

Rakdos Goblins 75 cards, 15 sideboard 4 {Dragonskull Summit} 8 {Mountain} 7 {Swamp} 3 {Blood Crypt} 22 lands 3 {Mogg Flunkies} 1 {Master of Cruelties} 1 {Hellrider} 2 {Krenko, Mob Boss} 4 {Legion Loyalist} 4 {Spike Jester} 1 {Pyrewild Shaman} 2 {Hellraiser Goblin} 2 {Guttersnipe} 3 {Goblin Arsonist} 23 creatures 4 {Searing Spear} 1 {Liliana of the Veil} 2 {Devil's Play} 2 {Mizzium Mortars} 4 {Pillar of Flame} 1 {Chandra, the Firebrand} 1 {Bonfire of the Damned} 15 other spells Sideboard 3 {Skullcrack} 2 {Rakdos's Return} 2 {Sever the Bloodline} 2 {Grafdigger's Cage} 2 {Slaughter Games} 4 {Dreadbore} 15 sideboard cards

[Roro]

Suggestions appreciated. I threw this together for my step son to use at tourney and he took 2nd place!  I dunno about pyrewild or master of cruelties. Help! I know it can be better.