Dies to Removal

Going to be testing a heavy black-based Mardu Aggro pretty soon, LP - here's what I got:

[deck]
4 Bloodsoaked Champion
4 Gnarled Scarhide
2 Tormented Hero
4 Pain Seer
4 Phyrexian Revoker
4 Herald of Torment
4 Butcher of the Horde

4 Thoughtseize
3 Hero's Downfall
3 Sarkhan, the Dragonspeaker

4 Mana Confluence
3 Nomad Outpost
4 Bloodstained Mire
3 Caves of Koilos
1 Urborg, Tomb of Yawgmoth
1 Mountain
8 Swamp
[/deck]

Mana base should be nearly as consistent as a mono-colored deck while not being too much more painful. Deck also packs in 11 flyers, a solid amount of removal/disruption, card drawing, and enough larger and Bestow creatures to give the deck plenty of relevant draws later in the game. Doesn't play Rabblemaster, but I really want to test Herald so it had to go.