Historical Rules · 1 February 2012
Rule 500.4
Official source text from the 1 February 2012 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 · 1 February 2012
Official source text from the 1 February 2012 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.