Can {cavern of souls} second tap ability be used to select a colorless mana?
Nope. Says "of any color"
Quote from: Juggalonoke on April 29, 2012, 12:20:00 AM
Can {cavern of souls} second tap ability be used to select a colorless mana?
Why would want a colorless mana?
Commander.... I use karn as a general and eldrazi annihilators in deck and them not being counted as I play them would be nice
Based on rule 903.9 "if non-commander colored mana would be added to your mana pool, colorless is added instead.". I'm paraphrasing, but you could chose any color and still wind up with colorless.