Dies to Removal

You pray not running into UB control with 8 dead cards in your MD...

Took Mardu Burn to a 6-3 finish (39th place, 240 players) at the MOCS today

[deck]
Lands 24
4 Nomad Outpost
4 Battlefield Forge
4 Caves of Kolios
4 Bloodstained Mire
6 Mountain
1 Swamp
1 Temple of Triumph

Creatures & Hordes 17
4 Monastery Swiftspear
4 Seeker of the Way
4 Goblin Rabblemaster
3 Butcher of the Horde
2 Hordeling Outburst

Burn 11
3 Magma Jet
4 Lightning Strike
4 Stoke the Flames

Planeswalkers 2
2 Sarkhan, Dragonspeaker

Other 6
4 Crackling Doom
2 Chained to the Rocks

Sideboard 15
2 Erase
2 Hushwing Gryff
2 Scouring Sands
1 Murderous Cut
4 Searing Blood
4 Eidolon of the Great Revel
[/deck]

It’s a pretty straightforward Burn Deck that splashes Black for Cackling Doom and Butcher. Compared to the RW variant, you get a little more game against the midrange decks (where the lifeloss is rather irrelevant) and you are a little weaker against Boss Sligh (of which I faced none in the MOCS).
I’m not 100% sure about the maindeck. Sideboard is OK (especially Searing Blood and Eidolon have been very good), but I guess there should be a pair of Sorins in there to replace Butcher in the matchups where your opponent boards in a ton of spot removal.

Some thoughts on possible directions in which to take this deck

(1) Drop Swiftspear for 1 Jet, 2 Outburst & 1 Butcher
(2) Keep Swiftspear, add 3 Defiant strike, possibly reducing 1 land and the 2 Hordeling Outburst
(3) Switch around the numbers of Hordeling Outburst + Goblin Rabblemaster

Thoughts / Suggestions welcome as always!