Temple of the Dragon Queen is a uncommon Land card from Adventures in the Forgotten Realms (AFR), collector number 357. Current market price: $0.41 (foil $3.96), TCGplayer market prices via Scryfall.
As this land enters, you may reveal a Dragon card from your hand. This land enters tapped unless you revealed a Dragon card this way or you control a Dragon. As this land enters, choose a color. {T}: Add one mana of the chosen color.