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Thanks to affinity for artifacts, it often costs less than 4 mana, especially in lists packed with cheap artifacts like Ichor Wellspring or Chromatic Star

And while theres no place for it in modern decks (if you really want to gain life per turn, there are better ways to do it), its an interesting bit of MTG history behind it so much so that Wizards reprinted it in the Brothers War: Retro Artifacts set

Planeswalkers currently have the legendary supertype attached to them, regardless of when they were released

The idea is that while a single copy of the Master Multiplied isn't too scary, he can quickly get out of control through exponential growth

If you have copies of those, youll likely only run afoul of a Commander reprinting or two which wont do much to the price