How bout one where we could undo the use of a Ice Melter or a Gaia seed Etc.. If anyone else has suggested this i didn't feel like looking at all the threads to find it.

as in it takes away the bonuses from an upgraded planet, and gives you the artifact? It just undoes the planet type but not the bonuses? Or it undoes the planet type and the bonuses w/o giving you an artifact back?

Undoes the bonuses and gives you the artifact back to use on another planet.

It could be cool, but I don't think right now the game knows that an MSM was used on a planet. It could work with the other artifacts, because they're a different type, but not with the MSM.