Illusion of Magora

Fliyng, defender
If this card becomes the target of a spell, sacrifice
it. When this card enters the battlefield, exile all creatures in all graveyards: players may cast exiled Spirit and Illusion creatures as long as you control
this card.
"The souls of the dead are so many, that even
Niv-Mizzet couldn't pronounce such number."
- Magora