Mindreaver

Oracle Text

Heroic — Whenever you cast a spell that targets Mindreaver, exile the top three cards of target player's library.

UU, Sacrifice Mindreaver: Counter target spell with the same name as a card exiled with Mindreaver.

Card Rulings

9/15/2013 Heroic abilities will resolve before the spell that caused them to trigger.
9/15/2013 Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
9/15/2013 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.
2/1/2014 The cards are exiled face up. All players can look at them.
2/1/2014 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.