Cas Barnum, Deceitful Orator

Changeling (This card is every creature type.)
You may look at the top card of your library at
any time.
When Cas Barnum, Deceitful Orator enters the battlefield, target creature gains +2/+0 until end
of turn.
{3}: Cas Barnum, Deceitful Orator becomes a
copy of target creature until the end of
your next turn.