Toughness
From Magic: The Gathering
Toughness is a measure for how much Damage a creature can take before it is Destroyed. A creature is dealt damage through battle or through spells. Creatures battling will each deal damage equal to their Powers to the other creatures toughness. If the power of the other creature is equal to or greater than the others toughness, then it is destroyed. If a creatures toughness is reduced to 0 in any other way, (-1/-1/ counters or a spell that gives -X/-X) damage cannot destroy it (the exception to this rule would be if this creature is Indestructible). A creature's toughness is the number on the right side of the box in the bottom right corner of a creature card. Many spells can modify a creatures Toughness or Power.
