Sacred Mesa is a special Enchantment card from Time Spiral Timeshifted (TSB), collector number 13. Current market price: $0.42 (foil $8.99), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a Pegasus. {1}{W}: Create a 1/1 white Pegasus creature token with flying.