Blight Mound is a rare Enchantment card from Secrets of Strixhaven Commander (SOC), collector number 208. Current market price: $0.38, TCGplayer market prices via Scryfall.
Attacking Pests you control get +1/+0 and have menace. Whenever a nontoken creature you control dies, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life."