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This spell can't be countered.
Destroy target nonland permanent with mana value 3 or less.
A spell or ability that counters spells can still target Abrupt Decay. When that spell or ability resolves, Abrupt Decay won't be countered, but any additional effects of the countering spell or ability will still happen.
If a permanent has {X} in its mana cost, X is considered to be 0.
The mana value of a token that isn't a copy of another object is 0. A token that is a copy of another object has the same mana cost as that object.
