Decaying Soil is a rare Enchantment card from Odyssey (ODY), collector number 127. Current market price: $0.54 (foil $15.28), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, exile a card from your graveyard. Threshold — As long as there are seven or more cards in your graveyard, this enchantment has "Whenever a nontoken creature is put into your graveyard from the battlefield, you may pay {1}. If you do, return that card to your hand."