Amanui, Voice of Ancestors

When Amanui, Voice of Ancestors enter the
battlefield, you may search your library for a
creature card, put that card into your graveyard,
then shuffle.
Whenever Amanui, Voice of Ancestors attack,
you may exile a creature card from your
graveyard. If you do, Amanui become a copy of
it, except it's name is still Amanui, Voice of
Ancestors, it's legendary in addition to its other
types, and it has this ability.