The only real downside is being mindful not to monopolize the game by taking a turn during everyone else turn, but as DJ Khaled says, that's just suffering from success
Some would also argue that a good token commander can always get by without the ability to generate tokens if it has a strong enough payoff like Purphoros, God of the Forge, and theres plenty of evidence that aligns with that school of thought
You do really want to reliably have something huge to cast with this because getting a free 6 mana creature or something isn't that big of a deal, especially when chapter 2 is meh and chapter 3 will cause your target to instantly eat removal
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Consequently, Yawgmoth is a rather expensive card at the moment, selling for around $28 on the low end
