Historical Rules · 30 September 2011
Rule 605.5
Official source text from the 30 September 2011 Rules release
Abilities that don't meet the criteria specified in rules 605.1a-b and spells aren't mana abilities.
Historical Rules · 30 September 2011
Official source text from the 30 September 2011 Rules release
Abilities that don't meet the criteria specified in rules 605.1a-b and spells aren't mana abilities.