Gyn, Phyrexian Concubine

As an additional cost to cast Gyn, Phyrexian Concubine, sacrifice a creature.
Creatures you control that a share a creature type with the sacrificed creature get +X/+X
and have lifelink, where X is Gyn, Phyrexian Concubine's power.

Elesh Norn will be pleased with this.