Emeria, the Sky Ruin is a rare Land card from Secret Lair Drop (SLD), collector number 1291. Current market price: $41.44 (foil $41.69), TCGplayer market prices via Scryfall.
This land enters tapped. At the beginning of your upkeep, if you control seven or more Plains, you may return target creature card from your graveyard to the battlefield. {T}: Add {W}.