If this creatureâ€™s power is negative as its ability resolves, X is considered to be 0. (This is a change from previous rulings.)
The value of X is calculated as Pathbreaker Ibexâ€™s ability resolves. Notably, if you attack with two Pathbreaker Ibex (and control no other creatures), the first ability to resolve will give those Ibex +3/+3. The second ability will then give them +6/+6.
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