Rhystic Cave
Land
: Choose a color. Add one mana of that color unless any player pays 
. Activate only as an instant.
Why is this card good?
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Printings (1)
Rulings (3)
- 2004-10-04
If a player pays
, Rhystic Cave does not produce any mana, and is not considered to have been tapped for mana. Things which trigger of the land being tapped for mana will not trigger. - 2004-10-04
Each player (starting with the current player and going in turn order) gets the option to pay when this ability resolves.
- 2004-10-04
The card’s ability has errata so you can’t activate the ability during casting of a spell or activating of an ability. This prevents you from getting into a position where someone paying
could stop you from having enough mana to pay for the spell. If you want to use it pay for a spell or ability, you need to use this card before you start the casting or activating.