Mel, Identity Curator

When Mel, Identity Curator enters the
battlefield you may search you library for up to
three creature cards and exile them face up.
{t}, Pay the mana cost of a creature exiled by
Mel, Identity Curator and put that card into
your graveyard: Target creature becomes a copy
of that creature until end of turn.
"I've met many interesting people, and you could be
one of them."