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Proxy cards are copies of real cards used as substitutes

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

Thus filling your graveyard, ripe for Delving away

Rinse and repeat until you are satisfied

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

This list could be extended to include a significant portion of all of the blue cards ever printed