This usually results in a pile of 6-10 cards, more if my deck needs a lot of mana to get going, less if I dont have access to a lot of good options and am trying not to replace too many of my lands with mana rocks
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I especially love this in Boros decks since that colors commander choices are usually quite aggressive and the color combination is lacking on card flow
Maybe you want to buy a couple of cards, Lewis added
You could focus only on cards that create black tokens, but that would leave a lot of great token generators out of this ranking: Treasures are colorless tokens, Bastion of Remembrance creates a white creature token, Pawn of Ulamog gives you a colorless Eldrazi token, etc