Revised it as first list wasn't really budget.
use cards like
Jishu, the Burning Brush and
Granite Acolyte to proc
Oni Forgemaster and stuff. Or if you have a couple on board early on then play bottoms up for a cheap proc and what not.
But the highest cost card is Jishu. There's no market. It's literally all 1/2/3 drops and four copies of a 4 cost card.
Okay so I've really revised the deck. It's turned into a oni/weapon synergy deck BUT it's very affordable if you ask me.
I've had two people test it for me and have hit gold and diamond starting from silver, so not so bad so far. I'm also gonna be testing it further.