Ghostly Herd of Reigndeer

Flash
As Ghostly Herd of Reigndeer enters the battlefield, you may destroy target creature.
If you do, it enters the battlefield as a copy of
this creature except its a Spirit in addition to its
other types.
Evoke {1}{b}{g}{u} (You may cast this spell for its
evoke cost. If you do, it's sacrificed when it enters the battlefield.)