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I'm fairly certain it means weapons with toughness less than X.So with 3 Disciples in play, a 3/4 weapon would not be negated.
Yes, although I doubt that would ever come up.
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No.
Ok, just to clarify, lets just say the 2/2 Warrior class Fallen Warrior has the 0/5 Warrior Class Goliath's Armor on. My opponent has 3 Disciples in play. Fallen Warrior is negated, but is Goliath's Armor?