Lucy Pevensie, Daughter of Eve

When Lucy Pevensie, Daughter of Eve enters the battlefield, you may search your library for a basic
land card, reveal it, put it into your hand, then
shuffle.
{t}: Add mana of any color to your mana pool.
Use the mana only to cast Legendary Creatures.
"It will not go out of my mind that if we pass this post
and lantern either we shall find strange adventures or
else some great changes of our fortunes."
-Lucy Pevensie