Legendary Artifact — Equipment
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If the equipped creature's power is negative while resolving the activated ability it gains, X is considered to be 0.
The value of X is determined as the activated ability resolves. If the equipped creature isn't on the battlefield at that time, use its power the last time it was on the battlefield to determine the value of X.
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: Other creatures you control gain trample and get +X/+X until end of turn, where X is this creature's power."