Rule 405.6 · Stack
Some things that happen during the game don’t use the stack.
Subrules
Effects don’t go on the stack; they’re the result of spells and abilities resolving. Effects may create delayed triggered abilities, however, and these may go on the stack when they trigger (see rule 603.7).
Mana abilities resolve immediately. If a mana ability both produces mana and has another effect, the mana is produced and the other effect happens immediately. If a player had priority before a mana ability was activated, that player gets priority after it resolves. (See rule 605, “Mana Abilities.”)
Special actions don’t use the stack; they happen immediately. See rule 116, “Special Actions.”
Turn-based actions don’t use the stack; they happen automatically when certain steps or phases begin. They’re dealt with before a player would receive priority (see rule 117.3a). Turn-based actions also happen automatically when each step and phase ends; no player receives priority afterward. See rule 703.
A player may concede the game at any time. That player leaves the game immediately. See rule 104.3a.