Leyline of Anticipation is a rare Enchantment card from Wilds of Eldraine: Enchanting Tales (WOT), collector number 23. Current market price: $4.58 (foil $10.55), TCGplayer market prices via Scryfall.
If this card is in your opening hand, you may begin the game with it on the battlefield. You may cast spells as though they had flash.