Brotherhood Headquarters is a uncommon Land card from Assassin's Creed (ACR), collector number 80. Current market price: $0.32 (foil $0.31), TCGplayer market prices via Scryfall.
{T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast an Assassin spell or a spell that has freerunning, or to activate an ability of an Assassin source.