Withercrown is a common Enchantment — Aura card from Kaldheim (KHM), collector number 119. Current market price: $0.17 (foil $0.32), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has base power 0 and has "At the beginning of your upkeep, you lose 1 life unless you sacrifice this creature."