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While you could opt for Terra, Magical Adept from the main set who has a WUBRG color identity in Commander maybe youre wanting to jam a more tried and tested Commander

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One of the more unique things you can do is utilize another commander on this list, Karn, Silver Golem, to animate regular artifacts, turning them into creatures, and then giving Marvin access to a whole plethora of abilities it was never meant to have

Mana Makes the World Go Round (Ramp) Commander needs mana for big spells