Die-hard green players probably already own a copy or two of Bane of Progress, and every Commander player needs Command Tower and Sol Ring
Here are how many of each were made in total (the total count is proportional to the amount of Rings in LotR): 300 double serialized foil Elven Sol Rings
BPhillipYork: This can be broken, there's way to create mana enough to blink this, Dockside Extortionist is an obvious huge mana generator here, but there's also Su-Chi and other sources, you could also do something like sacrificing Gnawing Vermin or Stitchers Supplier and generate a lot of mill, if you were into that sort of thing
multicolored space, and aside from breaking even against a Deathrite Shaman that is multicolored because of its hybrid mana identity, you get a good mana advantage and almost always have great targets
Sadly, theres no way to guarantee a freerunning creature will be in our graveyard, and the selection of freerunning assassins to pull from is slim
I don't expect to see these in 60-card constructed decks, but in Commander I can definitely see them having a profound impact
