Circle of Affliction is a uncommon Enchantment card from Planar Chaos (PLC), collector number 66. Current market price: $0.18 (foil $0.75), TCGplayer market prices via Scryfall.
As this enchantment enters, choose a color. Whenever a source of the chosen color deals damage to you, you may pay {1}. If you do, target player loses 1 life and you gain 1 life.