Ashnod's Altar

Carrion Feeder

Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Deathgreeter

Whenever another creature dies, you may gain 1 life.

Tormod, the Desecrator

Whenever one or more cards leave your graveyard, create a tapped 2/2 black Zombie creature token.
Partner (You can have two commanders if both have partner.)

Phyrexian Altar

Sacrifice a creature: Add one mana of any color.

Splendid Reclamation

Return all land cards from your graveyard to the battlefield tapped.

Energy Refractor

When Energy Refractor enters, draw a card.
{2}: Add one mana of any color.

Gravecrawler

Gravecrawler can't block.
You may cast Gravecrawler from your graveyard as long as you control a Zombie.