Réa the Masquerader

Whenever Réa the Masquerader attacks, exile
target card from a graveyard. If a creature
card was exiled this way, create a Blood token.

Whenever you sacrifice a Blood token, you may have Réa become a copy of a creature card
exiled with it until end of turn, except its name
is Réa the Masquerader, and it's a legendary Vampire in addition to its other types.