3 problems actually:
- It takes up a lot of precious text box real estate.
- It's not an immediately grokable term.
- It's not flavourful.
I'm not all that concerned about the last one but the other two seem like grounds enough to start looking for a new term.
The ideal choice would be "mana cost" but that's taken and even if we found a new name for mana cost, renaming cmc with a term that previously meant something else wouldn't be a good solution.
The best I can come up with are numbered and calculated mana cost. That or maybe turning mana cost into "casting cost" or "exact casting cost", with cmc becomming "numeric cost" or "casting cost" respectively.
Anyone out there have any better ideas?