Dragon Throne of Tarkir #54565
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Rulings (2)
Sep 20, 2014
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.
Jul 14, 2017
If the equipped creature's power is negative while resolving the activated ability it gains, X is considered to be 0.
