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Proxy cards are copies of real cards used as substitutes

It is not just your commanders colors, it includes mana symbols on the card, too

The Birds come down a turn earlier, require fewer colors to play, and generate any color of mana when they tap instead of just black

Five-color decks probably dont have a need for something like this since they have access to every other card Commander has to offer, but running this in some two-colored archetypes that may not run a lot of refill options, like Boros, could also be a good shout

However, you can use it to turn three generic mana into three energy counters, or three energy counters into three mana in any combination of colors