Cathedral of War is a rare Land card from Edge of Eternities: Stellar Sights (EOS), collector number 51. Current market price: $2.67 (foil $3.04), TCGplayer market prices via Scryfall.
This land enters tapped. Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.) {T}: Add {C}.