Text (OD+errata): 1/2. ; {W},{Tap}: Target permanent you control gains protection from instants and from sorceries until end of turn. [Oracle 2009/07/08]
The permanent affected by this ability cannot be targeted by instant and sorcery spells and (if it's a creature) all damage from instant and sorcery spells will be prevented. [Odyssey FAQ 2001/10/04]