The Great Henge is a mythic Legendary Artifact card from Tales of Middle-earth Commander (LTC), collector number 348. Current market price: $92.37 (foil $97.14), TCGplayer market prices via Scryfall.
This spell costs {X} less to cast, where X is the greatest power among creatures you control. {T}: Add {G}{G}. You gain 2 life. Whenever a nontoken creature you control enters, put a +1/+1 counter on it and draw a card.