Leyline of the Living

If Leyline of the Living is in your opening hand,
you may begin the game with it on the battlefield.

Undead creatures can't attack. (Ghosts, Shades, Skeletons, Specters, Spirits, Vampires, Wraiths, and Zombies are undead.)

At the beginning of each player's upkeep, they gain
one life as long as they don't control an undead creature.