In limited play (a way of playing in which each player gets the same quantity of unopened Magic product and creates his or her own deck using only this product), each deck must contain at least forty cards. A limited deck may contain as many duplicates of a card as are included with the product.

In limited play (a way of playing in which each player gets the same quantity of unopened Magic product such as booster packs and creates his or her own deck using only this product), each deck must contain at least forty cards. A limited deck may contain as many duplicates of a card as are included with the product.

In limited play involving individual players, all cards a player opens but doesn't include in his or her deck are in that player's sideboard.

In limited play involving individual players, all cards in a player's card pool not included in his or her deck are in that player's sideboard.

In limited play involving the Two-Headed Giant multiplayer variant, all cards a team opens but doesn't include in either player's deck are in that team's sideboard.

In limited play involving the Two-Headed Giant multiplayer variant, all cards in a team's card pool but not in either player's deck are in that team's sideboard.

In limited play involving other multiplayer team variants, each card a team opens but doesn't include in any player's deck is assigned to the sideboard of one of those players. Each player has his or her own sideboard; cards may not be transferred between players.

In limited play involving other multiplayer team variants, each card in a team's card pool but not in any player's deck is assigned to the sideboard of one of those players. Each player has his or her own sideboard; cards may not be transferred between players.

Only objects on the stack or on the battlefield have a controller. Objects that are neither on the stack nor on the battlefield aren't controlled by any player. See rule 108.4. There are four exceptions to this rule:

Only objects on the stack or on the battlefield have a controller. Objects that are neither on the stack nor on the battlefield aren't controlled by any player. See rule 108.4. There are five exceptions to this rule:

An ability that modifies the rules for deck construction functions before the game begins. Such an ability modifies not just the Comprehensive Rules, but also the Magic: The Gathering Tournament Rules and any other documents that set the deck construction rules for a specific Constructed format. However, such an ability can't affect the format legality of a card, including whether it's banned or restricted. The current Magic: The Gathering Tournament Rules can be found at Wizards.com/WPN/Events/Rules.aspx.

An ability that modifies the rules for deck construction functions before the game begins. Such an ability modifies not just the Comprehensive Rules, but also the Magic: The Gathering Tournament Rules and any other documents that set the deck construction rules for a specific format. However, such an ability can't affect the format legality of a card, including whether it's banned or restricted. The current Magic: The Gathering Tournament Rules can be found at Wizards.com/WPN/Events/Rules.aspx.

Abilities of emblems, plane cards, vanguard cards, and scheme cards function in the command zone. See rule 113, "Emblems"; rule 901, "Planechase"; rule 902, "Vanguard"; and rule 904, "Archenemy."

Abilities of emblems, plane cards, vanguard cards, scheme cards, and conspiracy cards function in the command zone. See rule 113, "Emblems"; rule 901, "Planechase"; rule 902, "Vanguard"; rule 904, "Archenemy"; and rule 905, "Conspiracy Draft."

There are six special actions:

There are seven special actions:

Planeswalkers have their own unique set of subtypes; these subtypes are called planeswalker types. The planeswalker types are Ajani, Ashiok, Bolas, Chandra, Domri, Elspeth, Garruk, Gideon, Jace, Karn, Kiora, Koth, Liliana, Nissa, Ral, Sarkhan, Sorin, Tamiyo, Tezzeret, Tibalt, Venser, Vraska, and Xenagos. If a player controls two or more planeswalkers that share a planeswalker type, that player chooses one of them, and the rest are put into their owners' graveyards. This "planeswalker uniqueness rule" is a state-based action. See rule 704.

Planeswalkers have their own unique set of subtypes; these subtypes are called planeswalker types. The planeswalker types are Ajani, Ashiok, Bolas, Chandra, Dack, Domri, Elspeth, Garruk, Gideon, Jace, Karn, Kiora, Koth, Liliana, Nissa, Ral, Sarkhan, Sorin, Tamiyo, Tezzeret, Tibalt, Venser, Vraska, and Xenagos. If a player controls two or more planeswalkers that share a planeswalker type, that player chooses one of them, and the rest are put into their owners' graveyards. This "planeswalker uniqueness rule" is a state-based action. See rule 704.

Phenomenon cards, scheme cards, and vanguard cards have no subtypes.

Phenomenon cards, scheme cards, vanguard cards, and conspiracy cards have no subtypes.

An ability word appears in italics at the beginning of some abilities. Ability words are similar to keywords in that they tie together cards that have similar functionality, but they have no special rules meaning and no individual entries in the Comprehensive Rules. The ability words are battalion, bloodrush, channel, chroma, constellation, domain, fateful hour, grandeur, hellbent, heroic, imprint, inspired, join forces, kinship, landfall, metalcraft, morbid, radiance, strive, sweep, tempting offer, and threshold.

An ability word appears in italics at the beginning of some abilities. Ability words are similar to keywords in that they tie together cards that have similar functionality, but they have no special rules meaning and no individual entries in the Comprehensive Rules. The ability words are battalion, bloodrush, channel, chroma, constellation, domain, fateful hour, grandeur, hellbent, heroic, imprint, inspired, join forces, kinship, landfall, metalcraft, morbid, parley, radiance, strive, sweep, tempting offer, threshold, and will of the council.

A guild icon appears in the text box of many Ravnica(r) and Return to Ravnica (tm) block cards. These cards either have the specified guild's exclusive mechanic or somehow relate to the two colors associated with that guild. Guild icons have no effect on game play. Similarly, a faction icon appears in the text box of most Scars of Mirrodin (tm) block cards. These faction icons have no effect on game play.

Some cards have decorative icons in the background of their text boxes. For example, a guild icon appears in the text box of many Ravnica: City of Guilds(r) and Return to Ravnica (tm) block cards, and a faction icon appears in the text box of most Scars of Mirrodin (tm) block cards. Similarly, many promotional cards include decorative icons. These icons have no effect on game play.

If you have priority, you may turn a face-down permanent you control face up. This is a special action; it doesn't use the stack (see rule 115). To do this, show all players what the permanent's morph cost would be if it were face up, pay that cost, then turn the permanent face up. (If the permanent wouldn't have a morph cost if it were face up, it can't be turned face up this way.) The morph effect on it ends, and it regains its normal characteristics. Any abilities relating to the permanent entering the battlefield don't trigger when it's turned face up and don't have any effect, because the permanent has already entered the battlefield.

Any time you have priority, you may turn a face-down permanent you control face up. This is a special action; it doesn't use the stack (see rule 115). To do this, show all players what the permanent's morph cost would be if it were face up, pay that cost, then turn the permanent face up. (If the permanent wouldn't have a morph cost if it were face up, it can't be turned face up this way.) The morph effect on it ends, and it regains its normal characteristics. Any abilities relating to the permanent entering the battlefield don't trigger when it's turned face up and don't have any effect, because the permanent has already entered the battlefield.

Unlike triggered abilities, state-based actions pay no attention to what happens during the resolution of a spell or ability.

Example: A player controls a creature with the ability "This creature's power and toughness are each equal to the number of cards in your hand" and casts a spell whose effect is "Discard your hand, then draw seven cards." The creature will temporarily have toughness 0 in the middle of the spell's resolution but will be back up to toughness 7 when the spell finishes resolving. Thus the creature will survive when state-based actions are checked. In contrast, an ability that triggers when the player has no cards in hand goes on the stack after the spell resolves, because its trigger event happened during resolution.

Unlike triggered abilities, state-based actions pay no attention to what happens during the resolution of a spell or ability.

Example:

Example: A player controls a creature with the ability "This creature's power and toughness are each equal to the number of cards in your hand" and casts a spell whose effect is "Discard your hand, then draw seven cards." The creature will temporarily have toughness 0 in the middle of the spell's resolution but will be back up to toughness 7 when the spell finishes resolving. Thus the creature will survive when state-based actions are checked. In contrast, an ability that triggers when the player has no cards in hand goes on the stack after the spell resolves, because its trigger event happened during resolution.

If a face-down permanent moves from the battlefield to any other zone, its owner must reveal it to all players as he or she moves it. If a face-down spell moves from the stack to any zone other than the battlefield, its owner must reveal it to all players as he or she moves it. At the end of each game, all face-down permanents and spells must be revealed to all players.

If a face-down permanent moves from the battlefield to any other zone, its owner must reveal it to all players as he or she moves it. If a face-down spell moves from the stack to any zone other than the battlefield, its owner must reveal it to all players as he or she moves it. If a player leaves the game, all face-down permanents and spells owned by that player must be revealed to all players. At the end of each game, all face-down permanents and spells must be revealed to all players.

If a player realizes that he or she can't legally take an action after starting to do so, the entire action is reversed and any payments already made are canceled. No abilities trigger and no effects apply as a result of an undone action. If the action was casting a spell, the spell returns to the zone it came from. The player may also reverse any legal mana abilities activated while making the illegal play, unless mana from them or from any triggered mana abilities they triggered was spent on another mana ability that wasn't reversed. Players may not reverse actions that moved cards to a library, moved cards from a library to any zone other than the stack, or caused a library to be shuffled.

If a player takes an illegal action or starts to take an action but can't legally complete it, the entire action is reversed and any payments already made are canceled. No abilities trigger and no effects apply as a result of an undone action. If the action was casting a spell, the spell returns to the zone it came from. The player may also reverse any legal mana abilities activated while making the illegal play, unless mana from them or from any triggered mana abilities they triggered was spent on another mana ability that wasn't reversed. Players may not reverse actions that moved cards to a library, moved cards from a library to any zone other than the stack, caused a library to be shuffled, or caused cards from a library to be revealed.