Mindbreaker and other cards in Dalaran Heist

I was spectating my friend do the final chapter in the dalaran heist. He had val’anyr, the 6 mana 4/2 paladin weapon that buffs a minion in your hand and re-equips after the minion dies, in his had. He played yogg and yogg played cataclysm. He was able to equip the weapon from it and attack to win the game. On the next game, he discovered mindbreaker, it disables hero powers. He played it and both him and the opponent were able to use their hero powers.

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So? That’s not a bug. Read the common issues sticky first next time.