Necra Sanctuary is a uncommon Enchantment card from Apocalypse (APC), collector number 45. Current market price: $0.12 (foil $4.04), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, if you control a green or white permanent, target player loses 1 life. If you control a green permanent and a white permanent, that player loses 3 life instead.