4 x
Prey Upon(use this with agent on lower creature and kill 2 with one)
Since the Agent's ability resolves first, you'll only get a 2-for-1 if your opponent is very dumb. They can just sac their creature you targeted.
I tested a different version last night that cut the Nemesis of Mortals entirely (went 2-0 before I had to go to bed). I've had Nemesis out on T3 twice now and he wasn't dominant or anything; then in the lategame he's pretty bad because there's just no way to force through damage with him (and I don't think Paragon is the answer).
I added the pair of Graveborn Muse because this is primarily a combo deck and we need to dig to assemble the pieces; the 3/3 body isn't terrible, either. I also added Griselbrand and the third Pelakka Wurm to strengthen the Reanimator subtheme.
I needed to make one last cut and ultimately went back to 23 land; I know it doesn't make sense to add two bombs then cut a land, but with all the Wayfinders, Visionaries, Ragers, and the addition of Muses I should be able to hit most of my drops. I also got my creature count to 31 in the process.
As far as Blasting Station I think it's probably a good bullet since we have two Rune-Scarred Demons, but there's no way to retrieve it if it lands in the 'yard without adding Treasured Find (which is also useless once binned). I think I'm going to leave them out for now.
I'll play with my updated build tonight to see how the bigger top end and extra draw performs.
I can't see myself cutting Nemesis at this point. He just works too well with what the deck is trying to do. If a 5/5 on t3 is not dominating the board the moment it hits, there's very little else you could do.
I'm also not feeling the need to draw more cards that you feel. Since most of your important cards work from the 'yard (Spawning and fatties), milling is almost like drawing.
Regarding Station, it's not a card I need to win, so I'm not really sad to see it milled. It's a card that makes the deck's strategy much more powerful, though.