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Fathomless Descent is a similar ability word, but it scales with the number of permanent cards in your graveyard

JODAH, THE UNIFIER It seems fitting to unify our options with one legendary Commander to rule them all

That said, this commander wont do much else for you so this card may be better off in the 99 of a Sythis, Harvest's Hand deck

What are some Commanders with the biggest downsides/drawbacks (things like Phage killing you when it enters the battlefield or Dralnu making you sacrifice when it takes damage)

Those mana sinks are both useful and powerful, and attacking with a modified creature isnt much of a hoop to jump through