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21 Hades - Infernal Schemer Fabled, Enchanted, Value $220 Hades is here looking good and causing chaos in this card from the Fabled set

Since you're in mono black, permanents like Bontu's Monument and The Darkness Crystal make it even easier to cast spells, allowing you to hold mana up for interaction

I like to think of it like the red Parallel Lives, and even if its not the commander its a staple in dragon-themed decks

since no player receives priority during the untap step, they can not react to what is happening

You'll want to pair this Mardu commander with mill cards like Mesmeric Orb and pinpoint graveyard hate like Lion Sash to get creatures in your opponents' graveyard and exile chaff like Llanowar Elves