Thranduil the Strategist is a mythic Legendary Creature — Elf Noble card from The Hobbit Commander (HOC), collector number 106. Current market price: $30.72, TCGplayer market prices via Scryfall.
Other Elves you control have "{T}: Add {G} or {U}." Landfall — Whenever a land you control enters, create a 1/1 green Elf creature token.