Necrotic Plague is a rare Enchantment — Aura card from Magic 2011 (M11), collector number 107. Current market price: $0.39 (foil $1.28), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has "At the beginning of your upkeep, sacrifice this creature." When enchanted creature dies, its controller chooses target creature one of their opponents controls. Return this card from its owner's graveyard to the battlefield attached to that creature.