This seems too cheap.

It seems cheap to me, but small creature-lands and creature-artifacts are often cheaper than I expect. If you take artifact-mana-cost-2-roughly-equivalent-to-land, this is Inkmoth Nexus without the infect, or Copper Myr without the colour but with flying and an activation cost.

With current design standards, I believe Wizards no longer makes 2cmc artifacts that produce mana. That's why this seems cheap.

They do just not usually in standard/limited Thought Vessel

So what knobs to we turn? Turning up the activation seems a bit weak, but doable. Turning up the casting cost seems really weak unless we make the one mana of any color instead

­Darksteel Ingot type card with the minor animation ability rather than indestructible seems like a potential option.

Basically a 5 color Keyrune

I like this version a lot more.

The problem with 2cmc artifacts that make mana is that they're, essentially, Rampant Growth in all colors.

Yep, this looks sensible now. I like the idea.

I'm aware of the problems of two mana rocks.

It was more of a thought experiment to see if there was some form of two mana rock that seemed acceptable. I clearly overshot :P

There is a lot of griping by some (not here) that "Cluestones are bad, more Mind Stones plz." Rather than just dismiss the idea, I thought I would at least try to make it work. There just seems to be a huge divide between the usefulness of two and three cost mana rocks. Even with cards like Chromatic Lantern often they just aren't good enough to see play.

Yeh I remember GA had a whole weekend challenge to try to make exciting 3cmc mana rocks.

Was really good! With Cipher, this card becomes awesome. Without cipher, it's weird... But hey! It's a manalith!

Can activate itself to mess with Will of the People for a turn.

I liked this card far more than I expected.

It looks great to me. Azorius Keyrune but making mana of any colour.