Yuna, Beseid Summoner

When Yuna, Beseid Summoner enters the battlefield, you may pay {x}. If you do, search
your library for an Eidolon creature card with converted mana cost X or less and put it onto
the battlefield. Then shuffle your library.
Yuna has hexproof as long as you control an
Eidolon.
{x}{w}{u}, {t}: Exile X target Spirits.