Sanctum of Fruitful Harvest is a uncommon Legendary Enchantment — Shrine card from Core Set 2021 (M21), collector number 203. Current market price: $0.40 (foil $4.44), TCGplayer market prices via Scryfall.
At the beginning of your first main phase, add X mana of any one color, where X is the number of Shrines you control.