Historical Rules · 25 September 2020
Rule 605.3c
Official source text from the 25 September 2020 Rules release
Once a player begins to activate a mana ability, that ability can’t be activated again until it has resolved.
Historical Rules · 25 September 2020
Official source text from the 25 September 2020 Rules release
Once a player begins to activate a mana ability, that ability can’t be activated again until it has resolved.