Black Mana

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.

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 while the