Out of all the zombies in Magic , Gravecrawler gets the nod as it is a simple 2/1 for 1 that can be cast ad infinitum from your graveyard - as long as you have another zombie in play that is
While you can happily play it in a non-plant deck, you pretty much have to run it in a plant focused deck
Xira, the Golden Sting, Massacre Girl, Known Killer and Kelsien, the Plague have slightly different methods of marking a target, while Vraska, the Silencer, Vein Ripper, and Twinblade Assassins are assassins which simply incentivize murder regardless of any prior mark
SPEED AND PRECISION Any mechanic which emphasises combat damage is fighting an uphill battle to achieve relevance in multiplayer Commander
Lively Dirge seems almost unplayable unless you have a bomb rare with mana value 4 or less in your pool