Ziatora's Proving Ground is a rare Land — Swamp Mountain Forest card from Streets of New Capenna Promos (PSNC), collector number 261s. Current market price: — (foil $15.04), TCGplayer market prices via Scryfall.
({T}: Add {B}, {R}, or {G}.) This land enters tapped. Cycling {3} ({3}, Discard this card: Draw a card.)