Sheoldred stabilizes, punishes greed, and forces answers immediately which is exactly what the best black creatures MTG players rely on are supposed to do
Elspeth, Storm Slayer Elspeth, Storm Slayer gets dropped into a Standard that's hostile to her mana value, but I think she might be good enough to see play anyway, Her abilities are great and work well together, but there are a ton of tools readily available in Standard that will work well with those abilities
Feather, The Redeemed A Master Of Combat Trickery Combat tricks, or instants and sorceries that grant stat and ability boosts to your creatures for a single turn, are a staple element of Magic that rarely make it into Commander decks
Its very resilient to removal, and you can apply pressure while being just disruptive enough to cross the finish line
Nurgle's Conscription grabs a creature from an opponent's graveyard and exiles the leftovers, leaving recursive decks in bad shape
Not only does this card inhibit an opponent's plans, it also drains their mana