Yitta, Tithon-lu Shepherd

Soulbond
Noncreature Channler — When you play your
first card with Channler this game, choose a
Channeler Color. Whenever you cast a
noncreature spell of the chosen color,
Proliferate.
Whenever you enchant a creature with a white
Aura card, proliferate.
As long as Yitta is paired with another creature,
both creatures are indestructible.