The second Mystic does have greatly diminishing returns in a deck like this, so there is an argument for just two (or three), but the power is so good and the mana so hard, I would guess we want to go to one extreme or the other
Red and green are also natural colors for dragons, so there are a few fantastic Gruul dragons like Atarka, World Render, Klauth, Unrivaled Ancient, and Savage Ventmaw
The Collector Booster Sample Pack that comes included with Commander decks will always have a foil showcase stained-glass uncommon as one of its two cards
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Marrow-Gnawer + Karumonix, the Rat King We have more rat commanders than you might expect, but you cant go wrong with Marrow-Gnawer or Karumonix, the Rat King