Alternatively, Ghoulcaller Gisa is the thirteenth most popular mono black commander, with just under 400 decks currently
As an Abzan commander, it misses out on two of the three core colors for theft commanders, and it requires additional support from cards that spread poison counters
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Then when you copy a spell, you toss a +1/+1 counter on this for winning
Being an Amber card, you have a lot of strong characters to choose from to fill this role: Mufasa, Betrayed Leader (how fitting), Hades, King Of Olympus, or Simba, Protective Cub (again, how fitting)
Its also worth noting that this isnt restricted to enchantment creatures