Sterling Grove is a uncommon Enchantment card from Invasion (INV), collector number 278. Current market price: $7.80 (foil $76.52), TCGplayer market prices via Scryfall.
Other enchantments you control have shroud. (They can't be the targets of spells or abilities.) {1}, Sacrifice this enchantment: Search your library for an enchantment card, reveal it, then shuffle and put that card on top.