605.1, Mana Abilities
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605.1. Some activated abilities and some triggered abilities are mana abilities, which are subject to special rules. Only abilities that meet either of the following two sets of criteria are mana abilities, regardless of what other effects they may generate or what timing restrictions (such as "Activate this ability only any time you could cast an instant") they may have.
605.1a An activated ability is a mana ability if it meets all of the following criteria: it doesn't require a target (see rule 115.6), it could add mana to a player's mana pool when it resolves, and it's not a loyalty ability. (See rule 606, "Loyalty Abilities.")
605.1b A triggered ability is a mana ability if it meets all of the following criteria: it doesn't require a target (see rule 115.6), it triggers from the resolution of an activated mana ability (see rule 605.1a) or from mana being added to a player's mana pool, and it could add mana to a player's mana pool when it resolves.
605.1a An activated ability is a mana ability if it meets all of the following criteria: it doesn't require a target (see rule 115.6), it could add mana to a player's mana pool when it resolves, and it's not a loyalty ability. (See rule 606, "Loyalty Abilities.")
605.1b A triggered ability is a mana ability if it meets all of the following criteria: it doesn't require a target (see rule 115.6), it triggers from the resolution of an activated mana ability (see rule 605.1a) or from mana being added to a player's mana pool, and it could add mana to a player's mana pool when it resolves.