Argoth, Sanctum of Nature is a rare Land card from The Brothers' War Promos (PBRO), collector number 256s. Current market price: — (foil $6.99), TCGplayer market prices via Scryfall.
This land enters tapped unless you control a legendary green creature. {T}: Add {G}. {2}{G}{G}, {T}: Create a 2/2 green Bear creature token, then mill three cards. Activate only as a sorcery. (Melds with Titania, Voice of Gaea.)