102.2. There are several ways to win the game.
102.2a A player still in the game wins the game if all of that player’s opponents have lost the game.
102.2b An effect may state that a player wins the game.
102.2c. In a multiplayer game between teams, a team with at least one player still in the game wins the game if all other teams have lost the game. Each player on the winning team wins the game, even if one or more of those players had previously lost that game.
102.3. There are several ways to lose the game.
102.3a A player can concede the game at any time. A player who concedes loses the game immediately.
102.3b If a player’s life total is 0 or less, he or she loses the game the next time a player would receive priority. (This is a state-based effect. See rule 420.)
102.3c When a player is required to draw more cards than are left in his or her library, he or she draws the remaining cards, and then loses the game the next time a player would receive priority. (This is a state-based effect. See rule 420.)
102.3d If a player has ten or more poison counters, he or she loses the game the next time a player would receive priority. (This is a state-based effect. See rule 420.)
102.3e If a player would both win and lose simultaneously, he or she loses.
102.3f In a multiplayer game between teams, a team loses the game if all players on that team have lost.
102.4. There are several ways to draw the game.
102.4a If all the players remaining in a game lose simultaneously, the game is a draw.
102.4b If the game somehow enters a “loop,” repeating a sequence of events with no way to stop, the game is a draw. Loops that contain an optional action don’t result in a draw.
102.4c In a multiplayer game between teams, the game is a draw if all remaining teams lose at once.
102.5. If a player loses the game, he or she leaves the game. Likewise, if a player leaves the game, he or she loses the game. The multiplayer rules handle what happens when a player leaves the game; see rule 600.4.
103.1. Whenever a card’s text directly contradicts these rules, the card takes precedence. The card overrides only the rule that applies to that specific situation. The only exception is that a player can concede the game at any time (see rule 102.3a).
103.2. When a rule or effect says something can happen and another effect says it can’t, the “can’t” effect wins. For example, if one effect reads “You may play an additional land this turn” and another reads “You can’t play land cards this turn,” the effect that keeps you from playing lands wins out. Note that adding abilities to objects and removing abilities from objects don’t fall under this rule. See rule 407, “Adding and Removing Abilities.”
103.3. If an instruction requires taking an impossible action, it’s ignored. (In many cases the card will specify consequences for this; if it doesn’t, there’s no effect.)
103.4. If multiple players would make choices and/or take actions at the same time, the active player (the player whose turn it is) makes any choices required, then the next player in turn order (usually the player seated to the active player’s left) makes any choices required followed by the remaining nonactive players in turn order. Then the actions happen simultaneously. This rule is often referred to as the “Active Player, Nonactive Player (APNAP) order” rule.
Example: A card reads “Each player sacrifices a creature.” First, the active player chooses a creature he or she controls. Then each of the nonactive players chooses a creature he or she controls. Then all creatures are sacrificed simultaneously.
103.4a A player knows the choices made by the previous players when he or she makes his or her choice.
103.4b If a player would make more than one choice at the same time, the player makes the choices in the order written, or in the order he or she chooses if the choices aren’t ordered.
104.1. The Magic game uses only natural numbers. You can’t choose a fractional number, deal fractional damage, and so on. When a spell or ability could generate a fractional number, the spell or ability will tell you whether to round up or down.
104.2. If a creature’s power or toughness, a mana cost, a player’s life total, or an amount of damage would be less than 0, it’s treated as 0 for all purposes except changing that total. If anything needs to use a number that can’t be determined, it uses 0 instead.
Example: If a 3/3 creature gets -5/-0, it deals 0 damage in combat. But to raise its power back to 1, you’d have to give it +3/+0 (3 minus 5 plus 3 is 1).
Example: If you control no permanents, the “highest converted mana cost among permanents you control” can’t be determined, so 0 is used instead.
104.3. The mana symbols are {W}, {U}, {B}, {R}, {G}, {X}, {Y}, and {Z}; the numerals {0}, {1}, {2}, {3}, {4}, and so on; the hybrid symbols {W/U}, {W/B}, {U/B}, {U/R}, {B/R}, {B/G}, {R/G}, {R/W}, {G/W}, and {G/U}; and the snow symbol {S}.
104.3a Each of the colored mana symbols represents one colored mana: {W} is white, {U} blue, {B} black, {R} red, and {G} green.
104.3b Numeral symbols (such as {1}) are generic mana costs and represent an amount of mana that can be paid with any color of, or colorless, mana.
104.3c The symbols {X}, {Y}, and {Z} represent unspecified amounts of mana; when playing a spell or activated ability with {X}, {Y}, or {Z} in its cost, its controller decides the value of that variable.
104.3d Numeral symbols (such as {1}) and variable symbols (such as {X}) can also represent colorless mana if they appear in the effect of a spell or ability that reads “add [mana symbol] to your mana pool” or something similar.
104.3e The symbol {0} represents zero mana and is used as a placeholder when a spell or activated ability costs nothing to play. A spell or ability whose cost is {0} must still be played the same way as one with a cost greater than zero; it won’t play itself automatically.
104.3f Each of the hybrid mana symbols represents a cost that can be paid with one of two colors: {W/U} in a cost can be paid with either white or blue mana, {W/B} white or black, {U/B} blue or black, {U/R} blue or red, {B/R} black or red, {B/G} black or green, {R/G} red or green, {R/W} red or white, {G/W} green or white, and {G/U} green or blue.
Example: {G/W}{G/W} can be paid by spending {G}{G}, {G}{W}, or {W}{W}.
104.3g If an effect would add one mana represented by a hybrid mana symbol to a player’s mana pool, that player chooses either of that symbol’s colors and adds one mana of that color to his or her mana pool.