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
In addition to hefty HP and a decent attack, the biggest draw is its "Psychic Embrace" ability
In general, looting a card back to the top of your deck is worse than discarding a card (since you can't take advantage of any graveyard synergies), which means the +1 is only powerful with a very narrow subset of cards (things like Miracles)
If any creatures with banding a player controls are blocking or being blocked by a creature, that player divides that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.) Artifact Nature's Blessing , Discard a card: Put a +1/+1 counter on target creature or that creature gains banding, first strike, or trample
SideBoard - Wayback Machine Duelist Invitational 1998
Siege cards may be better in Commander than in constructed as well since multiple players are capable of attacking a Siege