Trial of Reason

Trial
Creatures you control cannot attack.
{u}{b}: Target opponent reveals his or her hand, then he or she chooses a card in his or her hand and you name a card. If the card that player chose is the named card, exile Trial of Reason.
As long as Trial of Reason is exiled, creatures controlled by the player who controlled Trial of Reason when it was exiled get +1/+1 and gain hexproof for as long as Trial of Reason remains exiled.