Conspiracy declaring Zombie + Rooftop Storm + Haakon, Stromgald Scourge + Ashes of the Fallen declaring Knight

This is a bad combo I've had in my mind for a while now, and I've always wanted to use it in a deck. I figured Thrax would be the best general for the job, and so I went with it.

Here's the thing: I didn't know what else to do with the deck. I didn't have an idea for a theme except the combo and possibly zombies. So I went onto Metamox to see what cards are usually run in Thrax decks. It seems doing this resulted in the deck being a hybrid of zombie tribal and Grixis good stuff.

I'm posting this here so you guys can help me out here. The deck seems to run as is, but I think a little focus from some other clever brewing minds can do it good. I'll provide a maybeboard of cards that I think would be good. I am, however, building on a bit of a budget (even though I'm proxying to test the deck), so keep suggestions down to about $5 to $10 a card.