I'm wondering if an opponent has a dragon deck with crucible of fire and I use packs betrayal to take a dragon does it keep the +3/+3 or does it lose it since it no longer in his control
Crucible of Fire says "you control", so only the dragons controlled by the player who controls the Crucible get the +3/+3. Take control of your opponent's dragon, and that bonus goes away, since it comes from a static ability generating a continuous effect, immediately updating with every change to the game state.
Also, in the future please ask such questions in the rules forum. That's what it's for.
Also, in the future please ask such questions in the rules forum. That's what it's for.
Former Rules Advisor
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