Historical Rules · 27 September 2013
Rule 500.4
Official source text from the 27 September 2013 Rules release
When a step or phase ends, any unused mana left in a player's mana pool empties. This turn-based action doesn't use the stack.
Historical Rules · 27 September 2013
Official source text from the 27 September 2013 Rules release
When a step or phase ends, any unused mana left in a player's mana pool empties. This turn-based action doesn't use the stack.