Waning Wurm is a uncommon Creature — Zombie Wurm card from Planar Chaos (PLC), collector number 83. Current market price: $0.25 (foil $0.74), TCGplayer market prices via Scryfall.
Vanishing 2 (This creature enters with two time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)