Invincible Hymn

Count the number of cards in your library. Your life total becomes that number.

Oketra's Last Mercy

Your life total becomes equal to your starting life total. Lands you control don't untap during your next untap step.

Lifelink
At the beginning of your end step, each opponent mills X cards, where X is the amount of life you gained this turn.

Double target player's life total. Shuffle Beacon of Immortality into its owner's library.

Flying
When this creature enters, if your life total is less than your starting life total, it becomes equal to your starting life total.

Flying
If you would lose the game, instead exile this creature and your life total becomes equal to your starting life total.