Mono-Black Sheoldred Combo for Standard

The Wandering Emperor can create a 2/2 Samurai token with Vigilance, which can be used to enable Tenacious Underdog's ability to be cast from the graveyard at a later turn. This allows for recurring pressure on the opponent while maintaining board presence.

Invoke Despair can trigger Sheoldred's life-draining ability when opponents sacrifice creatures or enchantments. This can create a significant life advantage while also dealing damage to the opponent, synergizing well with the card's control theme.

Fable of the Mirror-Breaker generates tokens and can help filter through the deck, while Raffine's Informant can help fill the graveyard with creatures for flashback or synergy plays, enabling further card advantage and board presence.

Sorin can create Vampire tokens that can be used to either attack or block, while providing card advantage. Shivan Devastator, being a large flying creature, can be a powerful finisher that pairs well with Sorin's ability to buff creatures or provide life gain, creating a potent aerial threat.

Leyline Binding can be effectively used to control the board by exiling problematic permanents. Haunted Ridge provides a mana source that can help cast the Binding, while also providing a creature payoff for using the graveyard, creating a strong synergy between removal and creature generation.