The Soul Stone

You may {w}{u}{b}{r}{g} rather than The Soul
Stone's mana cost to cast this spell. As an
additional cost to The Soul Stone, sacrifice a
creature. You gain life two times the power
of the sacrificed creature.
Equip {6}
Equipped creature gets +1/+1, lifelink, and has
the creature types and abilities of the sacrificed
creature in addition to its own abilities and
creature types.