Crown of Gondor is a rare Legendary Artifact — Equipment card from Tales of Middle-earth Commander (LTC), collector number 485. Current market price: $5.59 (foil $6.44), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1 for each creature you control. When a legendary creature you control enters, if there is no monarch, you become the monarch. Equip {4}. This ability costs {3} less to activate if you're the monarch.