mtg commander deck guidelines How to Build a Magic: The Gathering (for Beginners) Basic Commander Deck template? :

Commander Format Excellence: Tailor your strategy with a legendary commander leading your forces

It can also get in unblockable to trigger combat damage triggers and can even draw you cards with its untap trigger

He eliminated cards he thought would be impossible to develop, would have to cost too much to be appealing, or were too similar to cards we were already planning to print in an upcoming set

You will need at least one other Zombie in play to be able to cast Gravecrawler from the graveyard, but once you get going, you can keep sacrificing your spare Zombie token to keep looping death triggers for whatever outlet you need