Ok, there is no such thing as deathless agony man....Lol. Wtf are you talking about?

Ok Spark Trooper is obviously pretty cool and very useful.....but Sin Collector is really only good against control and is probably sideboard material, not really sure what the deal with Dutiful Thrull is either, he doesn't seem to really fit a control mindset at all.Brain Maggot is also good, but easily removed, you should switch to Banishing Light . Also you might look at a stronger win con creature such as Blood Baron of Vizkopa or Obzedat, Ghost Council

All good suggestions. That said, Blood Baron is the only one I would consider, and that's not really something I want; by turn five I should be swinging hard with Spark Troopers with Charm kickers, or firing off Rakdos' Returns. Obzedat's color intensity concerns me for getting it off on-curve. Brain Maggot also tends to get a Gift of Orzhova dropped on it so it swings in with Lifelink instead of sitting there doing nothing like a Banishing Light would. Dutiful Thrull is highly underrated, I feel. It's a one-drop and regenerates for one as well, making it good in a large number of situations, especially if given the ability to stop fliers. It should be noted that this isn't a control deck. Its aggro-tempo with an emphasis on grappling against control.