Historical Rules · 15 July 2011
Rule 605.5
Official source text from the 15 July 2011 Rules release
Abilities that don't meet the criteria specified in rules 605.1ab and spells aren't mana abilities.
Historical Rules · 15 July 2011
Official source text from the 15 July 2011 Rules release
Abilities that don't meet the criteria specified in rules 605.1ab and spells aren't mana abilities.