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We are discussing the map, not the game's balance between factions. If you have complaints about that, you should address them in the mods section, not the mapmaking section.
A single artifact is being considered, not what is added to it. The staff is equal in power to the ring, and I don't understand why you're not suggesting removing it as well. Mass acceleration and mass deceleration can be used by anyone, regardless of whether they have the ring or not, and whether or not they use these spells is up to them. So, the argument "What if it's added..." is empty and meaningless.