The Commander casual variant uses an alternate mulligan rule. Each time a player takes a mulligan, rather than shuffling his or her entire hand of cards into his or her library, that player exiles any number of cards from his or her hand face down. Then the player draws a number of cards equal to one less than the number of cards he or she exiled this way. Once a player keeps an opening hand, that player shuffles all cards he or she exiled this way into his or her library. After all players have kept an opening hand, each player in turn order whose hand contains fewer cards than that player's starting hand size may look at the top card of his or her library. If a player does, that player may put that card on the bottom of his or her library.

The Commander casual variant uses an alternate mulligan rule. Each time a player takes a mulligan, rather than shuffling his or her entire hand of cards into his or her library, that player exiles any number of cards from his or her hand face down. Then the player draws a number of cards equal to one less than the number of cards he or she exiled this way. That player may look at all cards exiled this way while taking mulligans. Once a player keeps an opening hand, that player shuffles all cards he or she exiled this way into his or her library.

Some spells or abilities that produce mana restrict how that mana can be spent, or have an additional effect that affects the spell or ability that mana is spent on. This doesn't affect the mana's type.

Example: A player's mana pool contains {1}{U} which can be spent only to pay cumulative upkeep costs. That player activates Doubling Cube's ability, which reads "{3}, {T}: Double the amount of each type of mana in your mana pool." The player's mana pool now has {2}{U}{U} in it, {1}{U} of which can be spent on anything.

Some spells or abilities that produce mana restrict how that mana can be spent, have an additional effect that affects the spell or ability that mana is spent on, or create a delayed triggered ability (see rule 603.7a) that triggers when that mana is spent. This doesn't affect the mana's type.

Example: A player's mana pool contains {1}{U} which can be spent only to pay cumulative upkeep costs. That player activates Doubling Cube's ability, which reads "{3}, {T}: Double the amount of each type of mana in your mana pool." The player's mana pool now has {2}{U}{U} in it, {1}{U} of which can be spent on anything.

A spell or ability is modal if it has two or more options in a bulleted list preceded by "Choose one —," "Choose two —," "Choose one or both —," "Choose one or more —," "[A specified player] chooses one —," or similar. Each of those options is a mode.

A spell or ability is modal if it has two or more options in a bulleted list preceded by instructions for a player to choose a number of those options, such as "Choose one —." Each of those options is a mode. Modal cards printed prior to the Khans of Tarkir set didn't use bulleted lists for the modes; these cards have received errata in the Oracle card reference so the modes do appear in a bulleted list.

Some spells and abilities specify that a player other than their controller chooses a mode for it. In that case, the other player does so when the spell or ability's controller normally would do so. If there is more than one other player who could make such a choice, the spell or ability's controller decides which of those players will make the choice.

Some spells and abilities specify that a player other than their controller chooses a mode for it. In that case, the other player does so when the spell or ability's controller normally would do so. If there is more than one other player who could make such a choice, the spell or ability's controller decides which of those players will make the choice.

Modal spells and abilities may have different targeting requirements for each mode. Changing a spell or ability's target can't change its mode.

Modal spells and abilities may have different targeting requirements for each mode. Changing a spell or ability's target can't change its mode.

A copy of a modal spell or ability copies the mode(s) chosen for it. The controller of the copy can't choose a different mode. (See rule 706.10.)

A copy of a modal spell or ability copies the mode(s) chosen for it. The controller of the copy can't choose a different mode. (See rule 706.10.)

The Commander variant uses an alternate mulligan rule. Each time a player takes a mulligan, rather than shuffling his or her entire hand of cards into his or her library, that player exiles any number of cards from his or her hand face down. Then the player draws a number of cards equal to one less than the number of cards he or she exiled this way. That player may look at all cards exiled this way while taking mulligans. Once a player keeps an opening hand, that player shuffles all cards he or she exiled this way into his or her library. After all players have kept an opening hand, each player in turn order whose hand contains fewer cards than that player's starting hand size may look at the top card of his or her library. If a player does, that player may put that card on the bottom of his or her library.

The Commander variant uses an alternate mulligan rule. Each time a player takes a mulligan, rather than shuffling his or her entire hand of cards into his or her library, that player exiles any number of cards from his or her hand face down. Then the player draws a number of cards equal to one less than the number of cards he or she exiled this way. That player may look at all cards exiled this way while taking mulligans. Once a player keeps an opening hand, that player shuffles all cards he or she exiled this way into his or her library.

A spell or ability is "modal" if it has two or more options in a bulleted list preceded by "Choose one —," "Choose two —," "Choose one or both —," "Choose one or more —," "[A specified player] chooses one —," or similar. Each option is a "mode." See rule 700.2.

A spell or ability is "modal" if it has two or more options in a bulleted list preceded by instructions for a player to choose a number of those options, such as "Choose one —." See rule 700.2.