The Great Henge is a mythic Legendary Artifact card from Commander Masters (CMM), collector number 294. Current market price: $64.68 (foil $70.66), 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.