Amaterasu, Founder of the Blue

When this creature enters the battlefield, choose one —
•Search your library for an instant or sorcery card with mana value 4 or less, exile it.
You may cast that card without paying its
mana cost while it remains exiled.
•Search your library for an aura or equipment card with mana value 4 or less, exile it.
You may cast that card without paying its
mana cost while it remains exiled.