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↑ Section 107. Numbers and Symbols

107.4 The mana symbols are {W}, {U}, {B}, {R}, {G}, and {C}; the numerical symbols {0}, {1}, {2}, {3}, {4}, and so on; the variable symbol {X}; the hybrid symbols {W/U}, {W/B}, {U/B}, {U/R}, {B/R}, {B/G}, {R/G}, {R/W}, {G/W}, and {G/U}; the monocolored hybrid symbols {2/W}, {2/U}, {2/B}, {2/R}, {2/G}, {C/W}, {C/U}, {C/B}, {C/R}, and {C/G}; the Phyrexian mana symbols {W/P}, {U/P}, {B/P}, {R/P}, and {G/P}; the hybrid Phyrexian symbols {W/U/P}, {W/B/P}, {U/B/P}, {U/R/P}, {B/R/P}, {B/G/P}, {R/G/P}, {R/W/P}, {G/W/P}, and {G/U/P}; and the snow mana symbol {S}.

107.4a There are five primary colored mana symbols: {W} is white, {U} blue, {B} black, {R} red, and {G} green. These symbols are used to represent colored mana, and also to represent colored mana in costs. Colored mana in costs can be paid only with the appropriate color of mana. See rule 202, “Mana Cost and Color.” (refs: 202)
107.4b Numerical symbols (such as {1}) and variable symbols (such as {X}) represent generic mana in costs. Generic mana in costs can be paid with any type of mana. For more information about {X}, see rule 107.3. (refs: 107.3)
107.4c The colorless mana symbol {C} is used to represent one colorless mana, and also to represent a cost that can be paid only with one colorless mana.
107.4d The symbol {0} represents zero mana and is used as a placeholder for a cost that can be paid with no resources. (See rule 118.5.) (refs: 118.5)
107.4e A hybrid mana symbol is also a colored mana symbol, even if one of its components is colorless. Each one represents a cost that can be paid in one of two ways, as represented by the two halves of the symbol. A hybrid symbol such as {W/U} can be paid with either white or blue mana, and a monocolored hybrid symbol such as {2/B} can be paid with either one black mana or two mana of any type. A hybrid mana symbol is all of its component colors. Example: {G/W}{G/W} can be paid by spending {G}{G}, {G}{W}, or {W}{W}.
107.4f Phyrexian mana symbols are colored mana symbols: {W/P} is white, {U/P} is blue, {B/P} is black, {R/P} is red, and {G/P} is green. A Phyrexian mana symbol represents a cost that can be paid either with one mana of its color or by paying 2 life. There are also ten hybrid Phyrexian mana symbols. A hybrid Phyrexian mana symbol represents a cost that can be paid with one mana of either of its component colors or by paying 2 life. A hybrid Phyrexian mana symbol is both of its component colors. Example: {W/P}{W/P} can be paid by spending {W}{W}, by spending {W} and paying 2 life, or by paying 4 life.
107.4g In rules text, the Phyrexian symbol {H} with no colored background means any of the fifteen Phyrexian mana symbols.
107.4h When used in a cost, the snow mana symbol {S} represents a cost that can be paid with one mana of any type produced by a snow source (see rule 106.3). Effects that reduce the amount of generic mana you pay don’t affect {S} costs. The {S} symbol can also be used to refer to mana of any type produced by a snow source spent to pay a cost. Snow is neither a color nor a type of mana. (refs: 106.3)