Ragnarok, Devourer of Light

Artifact Devourer — Whenever Ragnarok, Devourer of the Light attacks, destroy target artifact or artifact creature.

Radiant Destruction — Whenever an artifact creature dies, destroy another target artifact.

Light Growth — Whenever an artifact creature dies, gain life equal to the artifact creatures power.

Resilient Return — Whenever Ragnarok, Devourer of the Light is destroyed, return it to the battlefield under your control at the beginning of the next end step.