Great video! I recently made a Calamity deck and i'm having tons of fun with it. One thing i would note that wasn't obvious to me while building the deck, is that the tokens that Calamity make don't have haste, so extra combate phases like great train heist feel kind of bad since you untap the tokens but they can't attack. I ended just using seize the day for extra combat and that's it. Also another couple of cards that i ended using in the deck that were quite good were Imposing grandeur and Visions of ruin, thanks to the high cmc of the commander those cards end shining quite a bit.

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