10/4/2004 It only produces one mana even if the land can produce more than one.

10/4/2004 This works even if the opponent¡¯s lands are tapped. It only checks what kinds of mana can be produced, not if the abilities that produce them are usable right now.

10/4/2004 The ability can be activated if the opponent has no lands that produce mana, but the effect will not be able to generate any mana.

10/1/2009 The colors of mana are white, blue, black, red, and green. Fellwar Stone can¡¯t be tapped for colorless mana, even if a land an opponent controls could produce colorless mana.

10/1/2009 Fellwar Stone checks the effects of all mana-producing abilities of lands your opponents control, but it doesn¡¯t check their costs. For example, Vivid Crag has the ability ¡°, Remove a charge counter from Vivid Crag: Add one mana of any color.¡± If an opponent controls Vivid Crag and you control Fellwar Stone, you can tap Fellwar Stone for any color of mana. It doesn¡¯t matter whether Vivid Crag has a charge counter on it, and it doesn¡¯t matter whether it¡¯s untapped.

10/1/2009 When determining what colors of mana your opponents¡¯ lands could produce, take into account any applicable replacement effects that would apply to those lands¡¯ mana abilities (such as Contamination¡¯s effect, for example). If there is more than one, consider them in any possible order.

10/1/2009 Fellwar Stone doesn¡¯t care about any restrictions or riders your opponents¡¯ lands (such as Ancient Ziggurat or Hall of the Bandit Lord) put on the mana they produce. It just cares about colors of mana.