Quote from 1110mystic »Really random idea - but would something like this work within the rules? (taking some language from battlemages)
Artifact - Equipment
If ~ was equipped with its equip cost, [put a charge counter on ~, and] equipped creature has " : add to your mana pool. Activate this ability only any time you could cast a sorcery and only once each turn."
If ~ was equipped with its equip cost, equipped creature has "X"
[If ~ would become unequiped from a creature remove all charge counters from it]
Bracketed language to deal with memory issues needed? Edit 2 to deal with the fact that you didn't want the creature to tap. . . and . . . i've made it too complex haven't I? Final edit - this I think allows for infinite targeting combos, unfortunately . . .
I'd balk at putting that kind of dual equip ability on a rare, much less a common designed to fill the mana rock niche. While the general idea of a piece of equipment that can serve multiples purposes is interesting, your execution is far too busy.