Ghost of Past and Future

Flying
Shimmer (When this creature enters the battlefield,
you may sacrifice a creature, then return it to the
battlefield under its owner's control.)
Vex — {w}{w}{b}{b}. (Create a token that's a copy of
this creature, except it's a 1/1 nightmare in addition
to its other types. Vex only as a sorcery.)
Geists haunt Celeia's dungeons.