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I like cards like this for decks like Fblthp, Lost on the Range or Yennett, Cryptic Sovereign, but it can even save certain cards you want to keep from a wheel effect or other hand manipulations

Mystery Booster is designed to provide an experience reminiscent of Cube or Chaos Draft, but out of a regular booster product

Found in the Reverse Holo slot of booster packs

You can pay one black mana and sacrifice another creature to have a player mill three cards, which is cool, but you can also pay one life to add one colorless mana which can only be used to cast spells from your graveyard

Its not necessarily a very knight-focused commander, but it can work if you build a nice removal-heavy deck around it