Historical Rules · 10 August 2018
Rule 605.3c
Official source text from the 10 August 2018 Rules release
Once a player begins to activate a mana ability, that ability can’t be activated again until it has resolved.
Historical Rules · 10 August 2018
Official source text from the 10 August 2018 Rules release
Once a player begins to activate a mana ability, that ability can’t be activated again until it has resolved.