So real life has driven me away from MTG, but I still play around when a new set comes out.
I've built Br zombies and BW tokens. My token build sucked, and I have my doubts about tokens in general, but here's what I've gleaned.
Evolving Wilds - it's the second dual-land for enemy colors in t2. Friendly colors have 8 dual lands that are practically free if you want mana turn 1.
Gravecrawler - With Diregraf Ghoul, black has 8 1 drops. This is almost more important than the revival thing, but cast from graveyard is still good. It's pseudo-evasion against creatures he'd trade with.
Smallpox is a mild synergy, but it's not enough to build around. Being able to play crawler from yard will save you a sac, but your deck needs to want a 2/1 non-blocker for that CA to be worth anything.
The zombie lords suck and are way too slow - neither the zombie tribe nor gy reanimation are linear - they don't get much better the more zombies you run, and gravecrawler doesn't need that many to gain value.
Mortarpod is good sb with him. Maybe md.
Lead with ghoul vs Mana Leak, lead with crawler vs blockers or removal.
Tragic slip - also good with Mortarpod.
Geralf's Messenger - Think of him as a burn spell more than a creature. 4 damage for 3 mana is good agro. The body is gravy.
Even with Triple black, remember that you can splash 8 sources of an allied color for nearly nothing.
Note that undying is great with Black Sun's Zenith - the +1/+1 counters go away, and he's free to return again. Not that I'd maindeck it, but I'd be careful running the sweeper vs undying.
EDIT - counters will not be removed if the creature dies to the counters. Thanks for rules clarification. It can still Remove counters if you cast it yourself to not kill the undyer
Undying blockers are a great reason to not run infect.
Strangleroot Geist - This is the only undying creature that's an especially good blocker.
Grafdigger's Cage - Not actually that good against Undying and Gravecrawler. Those base creature bodies are still beating you. It's more of a hoser against reanimation.
Thalia, Guardian of Thraben - didn't expermiment - seems nice, but not much synergy with Anthems or tokens.
Lingering Souls - Very good, but it lives in an environment alongside Timely Reinforcements, so it's not unprecedented power. Works nicely with the anthem, but Lingering souls isn't good enough to make Intangible Virtue and pure-tokens good.
Ratchet Bomb is legal. Diversify your creature base.
Sorin, Lord of Innistrad - surprisingly disappointing for a 4 mana planeswalker. Anthem ability is great, but you're paying 4 mana for an anthem. The tokens are small, non-flying, non-deathtouching, and non-white. How much better is Sorin than a planeswalker like Garruk Relentless?
Vault of the Archangel - pretty great, especially since the token decks' color requirements are so low. It works with manlands like blinkmoth as well, if you ever find yourself with 6 lands.
The problem with MBA is traditionally reach after an opponent stabilizes. Geralf's messanger helps here, but Incinerate + volley are easily splashed as well, and help quite a bit against protection in fact. Bump in the Night is mediocre, but it has won me a few games - burn is burn.14 Swamp
4 Dragonskull Summit
4 Blackcleave Cliffs
4 Diregraf Ghoul
4 Vampire Interloper
4 Highborn Ghoul
4 Geralf's Messenger
4 Bump in the Night
4 Brimstone Volley
2 Doom Blade
SB: 3 Deathmark
SB: 3 Black Sun's Zenith
SB: 3 Call to the Grave
SB: 3 Tragic Slip
SB: 3 Mortarpod
I can't seem to get it much faster than turn 5 without multiple 1 drops, but it's hard to defend against with the CA and varied evasion.
Worth noting that Vampire Interloper is the only creature that blocks well. This is a Liability vs agro, but it's actually quite a boon vs all these shapeshifter decks.
EDIT - Highborn Ghoul, not interloper.
I might want to bring the land count to 23, but I've been cheating because Dismember spoils me.
I've got too much SB dedicated to removal - I should probably add Manic Vandals or Shatter, but I'm still trying to figure the metagame out (RG agro became a thing?). Haven't been able to get Call to the Grave active yet, but I like the idea of it.
Don't have much time to play or playtest anymore - any immediate feedback on Zombies w/ burn?