The effect may be slow, but it can be game-winning if it actually goes off and can certainly make a game of Commander more interesting
The 3nd printing used a black Topps logo, and the foil cards used a sort of ray pattern
The Pokmon Company has not released official figures
Ive messed with the idea of building a domain deck with only two colors, and then using Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth in decks without black or green to get all five colors, without building a true five-color deck
Today, Full-Art Supporters have transformed into the blue-chip indicators of the TCG market
If your plan involves milling yourself, though, I can see it being useful, since it can be cast if you mill it over yourself