2013-09-15 : Heroic abilities will resolve before the spell that caused them to trigger.

2013-09-15 : Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.

2013-09-15 : Heroic abilities won’t trigger when a copy of a spell is created on the stack or when a spell’s targets are changed to include a creature with a heroic ability.

2014-02-01 : If Mindreaver leaves the battlefield, and later another Mindreaver enters the battlefield, it is a new object (even if the two were represented by the same card). The last ability of the second Mindreaver doesn’t refer to any cards exiled with the first one.

2014-02-01 : The cards are exiled face up. All players can look at them.