Cactus Preserve is a rare Land — Desert card from Outlaws of Thunder Junction Commander (OTC), collector number 76. Current market price: $3.09, TCGplayer market prices via Scryfall.
This land enters tapped. {T}: Add one mana of any type that a land you control could produce. {3}: Until end of turn, this land becomes an X/X green Plant creature with reach, where X is the greatest mana value among your commanders. It's still a land.