Morael, entombed witch

Indestructible
{t}: Add {g}or{b} to your mana pool
If your devotion to black and green is less than 7,
Proten isn't a creature, and has no other abilities.
{p/b}{p/b}{p/g}{p/g}, sacrifice a creature: target creature
perpetually gains gains +X/+X where X is that creatures power and becomes an Spirit in addition
to its other types.
"Through sacrifice, disparate powers intertwine,
forming a tapestry of unparalleled beauty."