Xantcha, Sleeper Agent Xantcha, Sleeper Agent seems to be a bit polarizing, but I honestly think this Rakdos commanders benefits outweigh their drawbacks as an opponent
Your companion's deckbuilding rule applies only to your starting deck, which is the deck you begin to play with each game
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Overall, while the concept of the card is interesting, it may not see much play in competitive Magic: The Gathering decks
There are sites out there that will do the formatting for you
There are other potential homes for this card, such as creature-light decks that can sacrifice a random token to grab big finishers like Blightsteel Colossus
