Celestial Colonnade is a rare Land card from Edge of Eternities: Stellar Sights (EOS), collector number 7. Current market price: $0.63 (foil $1.19), TCGplayer market prices via Scryfall.
This land enters tapped. {T}: Add {W} or {U}. {3}{W}{U}: Until end of turn, this land becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.