Thranduil's Company is a rare Creature — Elf Soldier card from The Hobbit (HOB), collector number 168. Current market price: $0.36 (foil $0.48), TCGplayer market prices via Scryfall.
As long as you control another Elf, you may play an additional land on each of your turns. Landfall — Whenever a land you control enters, put two +1/+1 counters on target creature you control. It gains vigilance until end of turn.