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For more details see here, and here I don't want to comment on the correctness of this belief, but it is mentioned here: This was allowed in 2007, apparently

This was only made possible by a rules change with Amonkhet that allowed players to control multiple planeswalkers of the same type as long as they hand different namespreviously, players could only control one planeswalker with the same type

Prowess has proven itself as a powerful keyword time and time again, but thats not even the half of it here

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pumpkinspice didn't specify if this deck is better at going first or second at the start of the duel

Where this falls down is in card advantage terms