You know me - I keep trying to find the room to justify Corpse Harvester in a zombie deck. The synergy he sees with the new Murderous Rider, however, is just perfect. The Harvester can fetch the Rider just like any other zombie. However, you can then play the Rider as a piece of Instant-speed removal! He's like a super-powerful Nameless Inversion. The fun doesn't stop there, though: you can still play the Rider as a creature, then sacrifice him to Harvester to fetch... himself! Since he goes back into your library as soon as he dies, a Corpse Harvester can fetch up the same Rider it sacrifices, getting you another kill spell ready and also grabbing a Swamp to boot.
One Swamp not enough? The ramp you can score with Korlash, Heir to Blackblade is enough to make any green deck, uh... green... with envy. Corpse Harvester can of course search up Korlash, seeing as he's a zombie. If you already have a copy of Korlash in play, though, you can immediately discard him to put two Swamps right into play in addition to one in your hand! Lord of the Undead can do the same once you have a Korlash in play and another in the graveyard, basically reading ": Search your library for two Swamps and put them into play tapped." With all the abilities to pay for and creatures to replay, there's a good chance you'll need the mana.
Gravecrawler is the perfect sacrificial lamb, being able to brought right back after Corpse Harvester trades him in for something more robust. Relentless Dead also does a pretty good job, serving as a nasty little attacker and even a way to bring back your other boys. Don't forget that if you're forced to sacrifice someone handy, Lord of the Undead can bring 'em back later.
Since the Harvester is so adept at tutoring, and zombies are strangely versatile, we have what may well be the first "Zomboard." Facing a white-heavy deck? Board in Marauding Knight, Stillmoon Cavalier and/or Western Paladin! Opponent also playing black? Time for Zombie Master to shine. Graveyard-reliant strategy? Agent of Erebos should be able to put a stop to that! You should only need one of any answer, since Corpse Harvester can fetch one of your silver bullets out on demand.
