Historical Rules · 5 June 2017
Rule 605.3c
Official source text from the 5 June 2017 Rules release
Once a player begins to activate a mana ability, that ability can’t be activated again until it has resolved.
Historical Rules · 5 June 2017
Official source text from the 5 June 2017 Rules release
Once a player begins to activate a mana ability, that ability can’t be activated again until it has resolved.