Tainted Sigil

{T}, Sacrifice Tainted Sigil: You gain life equal to the total life lost by all players this turn. (Damage causes loss of life.)

Sanguine Bond

Whenever you gain life, target opponent loses that much life.

{1}{W}{B}: Target creature gains lifelink until end of turn.
{1}{W}{B}: Whenever you gain life this turn, each opponent loses that much life.

Whenever an opponent casts a noncreature spell, that player loses 2 life and you gain 2 life.

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

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