The First Decomposer

Whenever a creature dies, that creatures controller may return a land card from their graveyard to their hand. For each opponent who does, choose one —
• Create a 1/1 green Isopod creature token.
• You gain 1 life.
• Draw a card.

{t}, Sacrifice a creature: Mill two cards. You may put a land card milled this way onto the battlefield tapped.

“Decay is generous. I just take my share first.”