Clearwater Goblet is a rare Artifact card from The List (PLST), collector number 5DN-109. Current market price: $1.39, TCGplayer market prices via Scryfall.
Sunburst (This artifact enters with a charge counter on it for each color of mana spent to cast it.) At the beginning of your upkeep, you may gain life equal to the number of charge counters on this artifact.