This decks mainboard is pretty much identical to mine, looks great! Why 4x Spreading Seas in the sideboard? When would you bring it in, or what matchups is it good against? I'd also consider swapping the Platinum Emperion in the sideboard for another copy of Platinum Angel. The angel is extremely good to land against infect, basically just wins the game. Emperion doesn't really have any matchups where that's the case and the Angel wouldn't do the same or better. I'd also suggest 2x Hurkyl's Recall in the sideboard. It makes affinity weep and at least in my meta, affinity is a large part of the decks that I play against. Here's my deck if you feel like taking a look: The Age of U|Tron

Thanks for comment. I use 4x ((Spreading Seas)) cause in the place I play modern many people use BURN, Spreading seas is good to stop them in combination with ((Chalice of the void)). I'll try your other suggestions.