Leyline of Hope is a rare Enchantment card from Duskmourn: House of Horror (DSK), collector number 369. Current market price: $0.86 (foil $1.55), TCGplayer market prices via Scryfall.
If this card is in your opening hand, you may begin the game with it on the battlefield. If you would gain life, you gain that much life plus 1 instead. As long as you have at least 7 life more than your starting life total, creatures you control get +2/+2.