the Card Mindbreaker doesn´t work in Hearthstone League of Explorers - Heroic Slitherspear and apparently to the tickets in the bugreportforum it doesn´t in most of the soloadventures either i didnt test it by my self but according to this, the card propably doesn´t work for most of the whole League of Explorers
please fix it
Mindbreaker is intentionally disabled from solo adventures, since disabling the opponent’s hero power would make the encounter trivial. I think some adventures may prevent you from building a deck with it, but even then if you generate one randomly, it would have no effect.
Not a bug.
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There is a list of card mentioned here: