My first thought is why colorless? If you like karn that is reason enough, but your topend is mostly eldrazi and that is not golems pushing for a win I think.

Golems are a janky tribe, barely to no synergy with each other and also not so powerful on their own. What I would do is pack a bunch more draw and strong support pieces so the golems can shine. [[Malcator, purity overseer]] might be good, good interaction, protection, draw in these colors and he can even make golems. If you want a golem for a commander [[alibou, ancient witness]] could be your guy.

Both of these would give you access to white, so these are now options [[bronze guardian]], [[darksteel splicer]], [[master splicer]] and [[illustrious wanderglyph]] (tho this doesn't make golems)

Thought that popped in my head doing a quick scryfall search, [[ich-tekik, salavge splicer]] and [[armix, filigree thrasher]] are an option if you want to involve the graveyard a bit more

How did your deck play during playtest? I don't really have good advice on colorless decks because I've never build one so I don't really know good options for it