Gravecrawler

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

Gisa and Geralf

When Gisa and Geralf enters, mill four cards.
Once during each of your turns, you may cast a Zombie creature spell from your graveyard.

Changeling (This card is every creature type.)
Changeling Outcast can't block and can't be blocked.

Whenever Undead Augur or another Zombie you control dies, you draw a card and you lose 1 life.