Godly Gerbil

Lifelink
When Godly Gerbil enters the battlefield, search
your library for a Legendary card and put it into
exile.
{4}{w}, {t}, Sacrifice Godly Gerbil: Return a
Legendary card from exile and cast it, if you
can legally do so (i.e. Legendary Sorcery).
Play this ability as a Sorcery.