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Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Rarity : Uncommon
Types : Artifact
Artist : John Avon
Flavor : "What do you have that I cannot obtain?" —Mairsil, the Pretender
Cost converted to mana : 2

Rulings

4 October 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.
4 October 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.
4 October 2004
It only produces one mana even if the land can produce more than one.
1 October 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.
1 October 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 “{T}, 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.
1 October 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.
1 October 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.

Liquimetal Coating

{T}: Target permanent becomes an artifact in addition to its other types until end of turn.

Custodi Soulbinders

Custodi Soulbinders enters the battlefield with X +1/+1 counters on it, where X is the number of other creatures on the battlefield. {2}{W}, Remove a +1/+1 counter from Custodi Soulbinders: Create a 1/1 white Spirit creature token with flying.