Giada, First among Faeries

Eminence -- whenever another faerie enters
into the battlefield under your control, if Giada,
First among Faeries is in the command zone or
on the battlefield, target player put the top card
of his or her library into his or her graveyard.
{u}{b}{g}, {t}, tap two other faeries you control:
you may cast target card into an opponent
graveyard without paying its mana cost.