Nylea's Intervention is a rare Sorcery card from Theros Beyond Death (THB), collector number 329. Current market price: $2.04 (foil $4.54), TCGplayer market prices via Scryfall.
Choose one — • Search your library for up to X land cards, reveal them, put them into your hand, then shuffle. • Nylea's Intervention deals twice X damage to each creature with flying.