See Gold uncommon submissions.
I suppose this is actually common, though, not uncommon.

I'd have thought so, but Manamorphose was uncommon in Modern Masters for some reason.

Because it's one of the highest rated red and/or green cards in Magic, According to Gatherer. I fear Cloud Aria is too good, for a similar reason, but I'm not sure how to calm it down. It would be a great card if it just made two mana... but people would ultimately compare it to Manamorphose, which is "just a common".

At two mana it would be so much worse than Manamorphose. It would literally be the same card but with a much harder to achieve casting cost. It's a color-fixing Pyretic Ritual or Desperate Ritual that requires two colors to cast. I suppose it should probably either be a sorcery or not cantrip, when I think of it that way.

Alternatively this could go up to ? Either making 3 mana and cantrip, or 4 mana and cantrip? More expensive rituals are much less dangerous. (Geosurge didn't do much anywhere, as far as I'm aware.)

Geosurge doesn't let you cast sorceries, and sorceries are the real bugger in combo-land. I'm guessing they did that on purpose. But I digress.

I assume the important part of this spell is the cantrip, yes? Would it be wrong to ask for a weird wash? I doubt it would be broken if the card cost and added to your mana pool (plus draw a card). Solves a lot of power level problems, while still being a great card for a very niche deck. That might not be what people want to see, perhaps. I think I'd like it for its wierdness, though.

If it kept the same cost, adding Esper mana would be almost over with me, except that it would be a very odd- looking card. I think Alex's suggestion of bumping the cost up to 3 is probably best fit now.