I wonder if you could blink Riders of Gavony and get protection from two creature types...
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I think Galepowder Mage and/or Momentary Blink could help out in this deck. Both of these would be used for a combo with Solemn Simulacrum or Wall of Omens.
While your curve says you have 12 1 mana cards, you really have 8. I would suggest cutting those 4-5 mana cards to just 2 a piece. I would suggest the same with Thalia because of the legendary status.
I like this deck, though maybe Soulcage Fiend could be replaced with something that doesn't hurt you as well. I would take out one Unhallowed Pact and put in another Black Cat.
I feel the Crusaders are redundant. Wilt-leaf Cavaliers is three plains, or forests, and has vigilance. It's a 3/4, while Crusader is only a 2/2. I don't mind seeing the Crusaders in the sideboard, because the protection is pretty useful.
No, I don't mean to put in harbinger, but giving an example of what a catcher is. The tutor you could use, but I'm not sure if there's a harbinger you could use. Goblin bombardment isn't a goblin spell, either. But if you think tutor is expensive, the cards I suggested taking out are all more expensive.
Like diabolic tutor or a harbinger.
Simple, since you don't have any catchers, add in gravecrawler. I'm thinking get rid of the whispering one, the hidden, and both harvester of souls and put in 4 crawlers. This will allow you to get out something early on, and also, you can sack every turn. (almost)
I can see fieldhunter and parish working together, but what else is there for fieldhunter? I like the idea of this deck, though I've never been a fan of protection from "whatever" cards like Mirran.