Eternity Vessel is a mythic Artifact card from Zendikar (ZEN), collector number 200. Current market price: $15.93 (foil $48.43), TCGplayer market prices via Scryfall.
This artifact enters with X charge counters on it, where X is your life total. Landfall — Whenever a land you control enters, you may have your life total become the number of charge counters on this artifact.