Agent of Masks

At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way.

Soul Warden

Whenever another creature enters, you gain 1 life.

If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.

Whenever a player casts a white spell, you may gain 1 life.

Create X 1/1 white Pegasus creature tokens with flying, where X is your life total.

Destroy all creatures. They can't be regenerated.

At the beginning of your upkeep, you gain X life, where X is the number of cards in your hand minus 4.

Whenever a player casts a black spell, you may gain 1 life.

({T}: Add {W} or {B}.)
As Godless Shrine enters, you may pay 2 life. If you don't, it enters tapped.

Exile target creature. Its controller gains life equal to its power.

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

As an additional cost to cast this spell, pay X life.
Each other player loses X life.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.