Priestess with Eyes of Blue

Whenever Priestess with Eyes of Blue becomes
the target of a spell or ability for the first time
in a turn, you may sacrifice a creature. If you do,
search your library for up to two Dragon
creature cards, reveal them, put them into your
hand, then shuffle your library.
{3}{w}, Put target creature you control at the
bottom of your library: Until end of turn, you
may play Priestess with Eyes of Blue from your
graveyard without paying its mana cost.