Fast B4 deck, inspired by haki1984: average simulated hand wins by T4.

Combos

1. Gravecrawler / Forsaken Miner / Oathsworn Vampire ( + meet their conditions) + Warren Soultrader / Phyrexian Altar + Payoff
2. Cloudstone Curio + Phyrexian Altar + 1 cmc nontoken, nonartifact Vampire + 1 cmc nonartifact Vampire + Payoff
   = Cast nonartifact Vampire, Cloudstone Curio triggers returning the nontoken, nonartifact Vampire to hand, activate Phyrexian Altar by sac the Vampire token
   • If you sub the Phyrexian Altar with Master of Dark Rites (or Agatha's Soul Cauldron with it imprinted) + Lightning Greaves / Mass Hysteria, you can extend the combo to 1-2 cmc black Vampire
   • Use Voldaren Epicure and you don't need a Payoff
3. Master of Dark Rites + Mass Hysteria + Cloudstone Curio + 1-drop black vampire
   = hasted vampires
   • If you sub Master of Dark Rites for Agatha's Soul Cauldron (with it imprinted), same result with 2 1-drop black vamps

Combos 2 & 3 avoid "grave hate".

4. Leonin Relic-Warder + Animate Dead / Necromancy / Dance of the Dead + Payoff

Turn-1 Wins

1. Dark Ritual, Culling the Weak + Combo pieces 1 + Swamp

   • Dark Ritual =
   • Payoff, ≥ floating
   • Culling the Weak by sac token =
   • Combo 1 or 2

2. Dark Ritual, Cabal Ritual, Susurian Voidborn, Warren Soultrader, Gravecrawler + Swamp

   • Dark Ritual =
   • Cabal Ritual =
   • Susurian Voidborn + Warren Soultrader
   • Sac token, Gravecrawler

Notes

• Payoff = Susurian Voidborn / Blood Artist / Vengeful Bloodwitch / The Meathook Massacre* / Cordial Vampire*. The Payoffs are all aggregated together, but there are differences; they are not all equivalent. For instance, Gravecrawler and Forsaken Miner are essentially the same: the former requires any zombie (cast), the latter a crime (triggered ability), so you need to target.
• Universal Automaton synergies with Goblin Engineer and Gravecrawler. Universal Automaton and Changeling Outcast synergy with Pyre of Heroes.
• Falkenrath Gorger + Necropotence = Casting vampires on cleanup step when you discard to hand size. Even with, e.g., Drannith Magistrate on battlefield, you secure your discarded vampires ("madness" is a triggered ability with replacement effect). If you don't cast it from exile, it will be putted to grave for later usage.
• Leonin Relic-Warder = Removal for stax artifacts & enchanments + win-con lines. Can also target your own Wishclaw Talisman.
• Activated abilities worth mentioning: Master of Dark Rites, Viscera Seer, Goblin Engineer, Captivating Vampire, Warren Soultrader, and Razaketh, the Foulblooded. Max Speed never functions.