Tarnation Vista is a mythic Land card from The Big Score (BIG), collector number 30. Current market price: $0.94 (foil $1.29), TCGplayer market prices via Scryfall.
This land enters tapped. As it enters, choose a color. {T}: Add one mana of the chosen color. {1}, {T}: For each color among monocolored permanents you control, add one mana of that color.