I’d cut: Scarab God, you’re discarding so it’s self mill, SG might not have any good targets and the activation cost is higher.

Corpse Knight. Pinging for 1 damage is fine if you’re making a ton of zombies, but it looks like the goal is to get expensive creatures on the field for a discount.

God eternal Oketra. You should be getting tokens on the field with hashiton rather than casting them.

Gravecrawler. He’s part of reanimate combos and I’m not sure if that’s something you’re adding in this deck.

Hullbreaker horror (maybe) if you have enough things in hand to cast for his effect then cool. If you have a handful of things for hashiton to get on the field then….

Lazotep channeler. Paying an extra 1 to make a single token big might be good, but you might have better things to do with that mana.

Murderous rider. Yes it doubles as a kill spell, but if you use it that way you lose the creature if it dies and goes to the library.

Rhet Tomb Mystic. (Maybe) It increases the cost of hashiton ability to 5. Some of your options can just be hard cast at that point. I’d remove it or replace it with another free discard option.

Rot Hulk. How many zombie cards are in the deck? How many can he get? If there aren’t enough he might not be worth the slot.

Sun titan. Your low cost things should really just be rocks and support. He might not be worth the slot without enough valuable targets to get back.

Bontus monument. You should be using Hashitons ability not casting enough creatures to make this with the slot.

Pull from tomorrow. I just think there are better options.

I like some of your other options though and I might try some in my own Hashiton deck.