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You can mill your own deck with Brain Freeze to build a storm count before killing out your opponent for the win

With all that mana and Instants like Chord of Calling, there is no end to why this card is broken

Each time you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents

Jund-era decks ate it for breakfast

Not Ranked: Acornelia, Fashionable Filcher A silver border prevents Acornelia, Fashionable Filcher from being your commander unless you have a Rule 0 conversation with your play group, but you could ignore the art-matters text to make that discussion easier