A -1/-1 counter is a game mechanic used in various collectible card games and board games. It represents a negative modifier that reduces the power and toughness of a creature or the characteristics of a permanent. When a permanent with a -1/-1 counter on it has its toughness reduced to zero or less, it is destroyed. -1/-1 counters can be placed on permanents as a result of spells or abilities, and they can also be removed by other spells or abilities.
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