Nihrax, Swarm Shepherd

All creatures you control have Decaybound: "If a creature with Decaybound dies,
you may exile it from the graveyard. If you do, you create a 1/1 green and black Insect token with Decaybound."
• Whenever a creature you control dies, you may return another creature with Decaybound from your graveyard to your hand.
• Whenever an Insect token you control dies, each opponent loses 1 life, and you gain 1 life.