Tree of Perdition

Defender
{T}: Exchange target opponent's life total with this creature's toughness.

Tree of Redemption

Defender
{T}: Exchange your life total with this creature's toughness.

Magus of the Mirror

{T}, Sacrifice this creature: Exchange life totals with target opponent. Activate only during your upkeep.

Axis of Mortality

At the beginning of your upkeep, you may have two target players exchange life totals.

Soul Conduit

{6}, {T}: Two target players exchange life totals.

Mister Negative

Vigilance, lifelink
Darkforce Inversion — When Mister Negative enters, you may exchange life totals with target opponent. If you lost life this way, draw that many cards.

Evra, Halcyon Witness

Lifelink
{4}: Exchange your life total with Evra's power.

Profane Transfusion

Two target players exchange life totals. You create an X/X colorless Horror artifact creature token, where X is the difference between those players' life totals.