Rules glossary
106.4 When an effect instructs a player to add mana, that mana goes into a player’s mana pool. From there, it can be used to pay costs immediately, or it can stay in the player’s mana pool as unspent mana. Each player’s mana pool empties at the end of each step and phase, and the player is said to lose this mana. Cards with abilities that produce mana or refer to unspent mana have received errata in the Oracle™ card reference to no longer explicitly refer to the mana pool.
- 106.4a If any mana remains in a player’s mana pool after mana is spent to pay a cost, that player announces what mana is still there.
- 106.4b If a player passes priority (see rule 117) while there is mana in their mana pool, that player announces what mana is there. (refs: 117)