Selvala, Explorer Returned is a rare Legendary Creature — Elf Scout card from Conspiracy (CNS), collector number 51. Current market price: $0.42 (foil $10.15), TCGplayer market prices via Scryfall.
Parley — {T}: Each player reveals the top card of their library. For each nonland card revealed this way, add {G} and you gain 1 life. Then each player draws a card. (Activate only as an instant.)