Test of Endurance

At the beginning of your upkeep, if you have 50 or more life, you win the game.

Felidar Sovereign

Vigilance (Attacking doesn't cause this creature to tap.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
At the beginning of your upkeep, if you have 40 or more life, you win the game.

Beacon of Immortality

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

Teferi's Protection

Until your next turn, your life total can't change and you gain protection from everything. All permanents you control phase out. (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.)
Exile Teferi's Protection.

Platinum Angel

Flying
You can't lose the game and your opponents can't win the game.

Avacyn, Angel of Hope

Flying, vigilance, indestructible
Other permanents you control have indestructible.