Warden of the Beyond

Oracle Text

Vigilance (Attacking doesn't cause this creature to tap.)

Warden of the Beyond gets +2/+2 as long as an opponent owns a card in exile.

Card Rulings

7/18/2014 Warden of the Beyond can’t get more than +2/+2 from its last ability, no matter how many opponents own a card in exile or how many exiled cards they own.