Sol Ring

T: Add one mana of any color in your commander's color identity.

Lifelink Whenever another nontoken creature you control dies, exile Liliana, Heretical Healer, then return her to the battlefield transformed under her owner's control. If you do, create a 2/2 black Zombie creature token.

At the beginning of your upkeep, you draw a card and lose 1 life.

Deathtouch

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to that card's mana value.

B, T, Sacrifice another creature: Create X 2/2 black Zombie creature tokens, where X is the sacrificed creature's power.

At the beginning of each upkeep, if you control no Snakes, create a 1/1 black Snake creature token with deathtouch.

As an additional cost to cast this spell, pay X life. All creatures get -X/-X until end of turn.