Dear Developer,
there is a Card in Hearthstone, that cannot be attack by the Hero and in this case it was possible.
I tried to upload this screenshot and to post it here but it doenst work.
The Problem is, Illidan attacked with his hero ability an Monster, which said " This Monster cannot be a target of spell or Heroability.
In german it is like this “Kann nicht als Ziel von Zaubern oder Heldenfähigkeiten gewählt werden.”
So in logical thought it is not possible that the Hero cant attack with his ability that Monster.
yours sincerly,
Can