Galeem, the Vile Light

Flying, lifelink, trample
Spirit offering (You may cast this card any time you
could cast an instant by sacrificing a spirit permanent.
If you do, the total cost to cast this card is reduced by
the sacrificed permanent's mana cost.)
Whenever a non-spirit creature leaves the
battlefield, create a token that's a copy of it,
except it's a spirit in addition to it's other types.