|Parts of a Card|
|Spells, Abilities, and Effects|
The stack is the game zone where spells and abilities are put when they are played and where they wait to resolve.   Spells and abilities are put on top of the stack as the first step in being played, and are removed from it as the last step of resolving.
Any spell or ability that uses the stack can be 'responded to' by all players, meaning players have a chance to play spells and abilities with it still on the stack. Since the stack resolves in order from top to bottom, those spells and abilities will resolve before the spell they were played "in response" to. Spells and abilities on the stack resolve one at a time, with a chance for each player to play spells and abilities in between each resolution. Actions that do not use the stack, such as paying costs, playing mana abilities or turning a face-down creature with morph face-up, cannot be responded to.
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Actions that use the stack
- casting spells
- activating non-mana abilities
Actions that don't
- playing a land;
- tapping a permanent for mana;
- unmorphing a creature;
- phasing in and out at the start of the untap step (see rule 302.1);
- untapping at the start of the untap step (see rule 302.2).
- drawing a card at the start of the draw step (see rule 304.1);
- declaring attackers at the start of the declare attackers step (see rule 308.1);
- declaring blockers at the start of the declare blockers step (see rule 309.1);
- the active player discarding down to his or her maximum hand size at the start of the cleanup step (see rule 314);
- removing damage from permanents and ending "until end of turn" and "this turn" effects at the start of the cleanup step (see rule 314);
- exiling a card with suspend using its suspend ability. 
An action that does not use the stack is called a "game action".
- ↑ Ted Knutson. (November 04, 2006.) "The Dynamics of a Turn", Daily MTG, magicthegathering.com, Wizards of the Coast.
- ↑ Mark Rosewater. (November 20, 2006.) "On The Stack", Daily MTG, magicthegathering.com, Wizards of the Coast.
- ↑ http://www.londes.com/?id=1399
- ↑ http://www.ebbemunk.dk/magic/rules_p9.html