I haven't tried the deck, so I might be wrong here but I don't see how running weak deathtouch creatures and a 2 of surge is good value, seems weak without seance and at that point it is getting to be too cute of a combo.. Maybe. Although thinking more on it i do like the surge in the deck
In anycase id cut the auger spree's, even if they have good synergy, for a playset of shocks. Much more effective against aggro, and i don't think you will have a problem with creatures on later turns. Imo if you are dropping fatties with surge out, you don't need to push even more damage.
If you are playing aggro and have a vital creature on the board wanting to swing, but there is a
Pharika's Chosen staring it down yet you have no shocks or other removal in hand forcing you to not swing. Or swing into it to remove the road block. Either way this scenario would seem to be advantageous for the opponent. This weak DT creature just disrupted your game plan, as much damage as possible every turn. Further progressing their inevitability.
Auger Spree does not seem the most optimal choice in terms of removal I will admit. But shock is no better. Yondar made a perfect point that shocks do not take out x/4 creatures. But the Augers do offer a little diversity in purpose as well. Either removal or win more in the mid to late game.
If we are talking about the removal of the Assistants. I would think about the
Lone Missionary. Death touch and life gain are 2 perfect ways to disrupt aggro. That and without something feeding the graveyard, more creatures to feed seance would be ideal.
Phyrexian Rager fits right in the curve as well.