Realm of Koh is a rare Land card from Avatar: The Last Airbender Promos (PTLA), collector number 276s. Current market price: — (foil $2.75), TCGplayer market prices via Scryfall.
This land enters tapped unless you control a basic land. {T}: Add {B}. {3}{B}, {T}: Create a 1/1 colorless Spirit creature token with "This token can't block or be blocked by non-Spirit creatures."