Necrogen Communion is a uncommon Enchantment — Aura card from Phyrexia: All Will Be One (ONE), collector number 99. Current market price: $0.35 (foil $0.42), TCGplayer market prices via Scryfall.
Enchant creature you control Enchanted creature has toxic 2. (Players dealt combat damage by it also get two poison counters.) When enchanted creature dies, return that card to the battlefield under your control.