My take on 8-Rack. Tom Ross influenced.
I'm not entirely sold on Collective Brutality or Ensnaring Bridge (MB or SB)
Most of my uncertainties lie in my Sideboard.
I'm currently debating these changes: MB: -1x Bontu's +1x Dismember
However I like the idea of having a board wipe main board for heavy aggro. Some people swear by Ensnaring Bridge, however it adds heavy to the mana curve, and also making your removal and Mutavault (which is a consistent win condition) almost arbitrary.
SB: -1x Shadow of Doubt -2x Ratchet Bomb -1x Bontu's +1x Delirium Skeins +1x Fatal Push +1x Nihil Spellbomb (Any combination)
Ratchet Bomb seems like such a versatile answer to many things such a Chalice, Pithing Needle, EE, Tribal/Tokens, or other enchants/artifacts I would typically try to ignore (but often win the game for my opponent).
Shadow of Doubt seems great for fetches or other green search, but given its specific condition (and necessity to leave up 2 Black)it may be better to just have removal for whatever they cast, considering the optimal time for this card is in the first 2-4 turns, I'd rather be shredding their hand I think.
I know many people consider 4x Leyline a necessity, but I'm not convinced I need to spend the money on the last 2 when Nihil does the job in a similar way while providing a minor card advantage (worth the trade-off imo). Saying that, only having 3x graveyard hate may be greedy. In which my priority change in SB would be: -1x Shadow of Doubt +1x Nihil Spellbomb
Delirium is great against control and Leyline of Sanctity, but is 4x overkill? If not, since I'm convinced Ratchet Bomb is a versatile answer (even though its a slow creature wipe), maybe only SB 1x Bontu's if I keep the 1x Bontu's MB. Then +1x Skeins?
I'd love to hear any thoughts!