Gairros, Abjurer P.H.D

As Gairros, Abjurer P.H.D, enters the battlefield, choose a color.
Wizards & soldiers you control have hexproof
from the chosen color.
Whenever two or more wizards or soldiers you
control attack, you may search your library for a
white enchantment or white instant card, revile it
& put it into your hand, then shuffle your library.