Regal Ancestor Spirit

Flash
Flying

Soul Siphon - Return a creature you control to its owner's hand: Regenerate Regal Ancestor Spirit.

Rebirth - Sacrifice Regal Ancestor Spirit: Creatures you control gain indestructible until end of turn.

Ancestral spirits exist as a phenomenon beyond the purview
of the Erdtree. Life sprouts from death, as it does from birth. Such is the way of the living.