Rhystic Cave

Text:

: Choose a color. Add one mana of that color unless any player pays . Activate only as an instant.

Rulings:

• 10/4/2004 If a player pays <img src="/Handlers/Image.ashx?size=small&amp;name=1&amp;type=symbol" alt="1" align="absbottom" />, 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.
• 10/4/2004 Each player (starting with the current player and going in turn order) gets the option to pay when this ability resolves.
• 10/4/2004 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 <img src="/Handlers/Image.ashx?size=small&amp;name=1&amp;type=symbol" alt="1" align="absbottom" /> 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.