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This search based on the December 22, 2008 release of the Rulings.
104 - Numbers and Symbols
- 104.1 - The Magic game uses only integers. [CompRules 2007/05/01]
- 104.1a - You can't choose a fractional number, deal fractional damage, gain
fractional life, and so on. If a spell or ability could generate a
fractional number, the spell or ability will tell you whether to round up
or down. [CompRules 2007/05/01]
- 104.1b - Most of the time, the Magic game uses only positive numbers. You
can't choose a negative number, deal negative damage, gain negative life,
and so on. However, it's possible for a game value, such as a creature's
power, to be less than zero. If a calculation or comparison that would
determine the result of an effect needs to use a negative value, it does
so. If such a calculation yields a negative number, zero is used instead,
unless that effect sets a player's life total to a specific value, sets a
creature's power or toughness, changes a creature's power or toughness to
a specific value, or otherwise modifies a creature's power or toughness.
[CompRules 2008/05/01]
Example: If a 3/4 creature gets -5/-0, it's a -2/4 creature. It deals no
damage in combat. Its total power and toughness is 2. You'd have to give
it +3/+0 to raise its power to 1. [CompRules 2007/05/01]
Example: Viridian Joiner is a 1/2 creature that says "{Tap}: Add an
amount of {G} to your mana pool equal to Viridian Joiner's power." An
effect gives it -2/-0, then its ability is activated. The ability adds no
mana to your mana pool. [CompRules 2007/05/01]
- 104.2 - If anything needs to use a number that can't be determined, either
as a result or in a calculation, it uses 0 instead. [CompRules 2007/05/01]
- 104.3 - The mana symbols are {W}, {U}, {B}, {R}, {G}, and {X}; the
numerals {0}, {1}, {2}, {3}, {4}, and so on; the bybrid 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}, and {2/G}; and
the snow symbol {S}. [CompRules 2008/05/01]
- 104.3a - Each of the colored mana symbols represents one colored mana: {W}
is white, {U} blue, {B} black, {R} red, and {G} green.
[CompRules 2003/07/01]
- 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.
[CompRules 2003/07/01]
- 104.3c - The symbol {X} represents an unspecified amount of mana. When
playing a spell or activated ability with {X} in its cost, its controller
decides the value of that variable. [CompRules 2007/10/01]
- 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. [CompRules 2003/07/01]
- 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.
[CompRules 2003/07/01]
- 104.3f - Each of the hybrid mana symbols represents a cost that can be paid
in one of two ways, as represented by the two halves of the hybrid mana
symbol. A bybrid symbol such as {W/U} 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 color of, or colorless, mana.
A hybrid mana symbol is all of its component colors.
[CompRules 2008/05/01]
Example: {G/W}{G/W} can be paid by spending {G}{G}, {G}{W}, or {W}{W}.
[CompRules 2005/10/01]
- 104.3g - If an effect would add mana represented by a hybrid mana symbol to
a player's mana pool, that player chooses one half of that symbol. If a
colored half is chosen, one mana of that color is added to that player's
mana pool. If a colorless half is chosen, an amount of colorless mana
represented by that half's number is added to that player's mana pool.
[CompRules 2008/05/01]
- 104.3h - If a cost would be reduced by an amount of mana represented by a
hybrid mana symbol, the player paying that cost chooses one half of that
symbol at the time the cost reduction is applied (see Rule 409.1f). If a
colored half is chosen, the cost is reduced by one mana of that color (or,
if the cost can't be reduced by one mana of that color, the cost is
reduced by one generic mana). If a colorless half is chosen, the cost is
reduced by an amount of generic mana equal to that half's number.
[CompRules 2008/05/01]
- 104.3i - The snow mana symbol {S} represents a cost that can be paid with
one mana produced by a snow permanent. This is a generic mana cost that
can be paid with any color of, or colorless, mana. Effects that reduce
the amount of generic mana you pay don't affect {S} costs.
[CompRules 2008/05/01]
- 104.4 - The tap symbol is {Tap}. The tap symbol in an activation cost
means "Tap this permanent." A permanent that's already tapped can't be
tapped again to pay the cost. Creatures that haven't been under a
player's control continuously since the beginning of his or her most
recent turn can't use any ability with the tap symbol in the cost.
See Rule 212.3f. [CompRules 2003/07/01]
- 104.5 - The untap symbol is {Untap}. The untap symbol in an activation cost
means "Untap this permanent." A permanent that's already untapped can't
be untapped again to pay the cost. Creatures that haven't been under a
player's control continuously since the beginning of his or her most
recent turn can't use any ability with the untap symbol in the cost.
See Rule 212.3f. [CompRules 2008/05/01]
- 104.6 - A tombstone icon appears to the left of the name of many
Odyssey(tm) block cards with abilities that are relevant in a player's
graveyard. The purpose of the icon is to make those cards stand out when
they're in a graveyard. This icon has no effect on game play.
[CompRules 2008/05/01]
- 104.7 - A type icon appears in the upper left corner of each card from the
Future Sight(tm) set printed with an alternate "timeshifted" frame. If
the card has a single card type, this icon indicates what it is: claw
marks for creature, a flame for sorcery, a lightning bolt for instant, a
sunrise for enchantment, a chalice for artifact, and a pair of mountain
peaks for land. If the card has multiple card types, that's indicated by
a black and white cross. This icon has no effect on game play.
[CompRules 2008/05/01]
- 104.8 - Each activated ability of a planeswalker has an arrow-shaped loyalty
symbol in its cost. Positive loyalty symbols point upward and feature a
plus sign followed by a number or an X. Negative loyalty symbols point
downward and feature a minus sign followed by a number or an X. [+N]
means "Put N loyalty counters on this permanent," and [-N] means "Remove N
loyalty counters from this permanent." [CompRules 2008/05/01]
This search based on the December 22, 2008 release of the Rulings.
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