Morrigan, Witch of the Wilds

You may look at the top card of your library.
(You may do this at any time.)
{g}{u}: Reveal the top card of your library. If it's a
non-Human creature card, you may have
Morrigan, Witch of the Wilds become a copy of
that card until your next turn, except its name is Morrigan, Witch of the Wilds, it's legendary in addition to its other types, and it has this ability. Otherwise, you may put that card on the bottom
of your library.