I dont think Id run this as my commander, though
It also keeps your opponent guessing as to your plans, or allows you to shift (pun intended) your plans on the fly to deal with your opponents current position
But somehow it hits just as hard here, conveyed entirely through rules text
So, pick your favorite, shuffle up, and prepare to dominate the table--just don't be surprised if your playgroup starts targeting you first.
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Being able to hold up mana to interact and then dump it into casting something outside of normal timing restrictions is incredibly powerful in Commander, so I definitely think that this card will be a big hit in the format