Shrine of Boundless Growth is a uncommon Artifact card from New Phyrexia (NPH), collector number 152. Current market price: $0.16 (foil $0.69), TCGplayer market prices via Scryfall.
At the beginning of your upkeep and whenever you cast a green spell, put a charge counter on this artifact. {T}, Sacrifice this artifact: Add {C} for each charge counter on this artifact.