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The fact that "relentless" shows up in the name tells me they were considering the ability from the start, even if the first version didn't include it

Its also another extra-combat spell for Etali, Primal Storm and other decks that lose out by free-casting traditional extra combat spells during combat when most of them do nothing thanks to the wording usually being after this main phase (which means in combat the spell does nothing)

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While the cost of dual lands make it hard to do on a budget, both blue-white and blue-black mill could go a long way to solving the deck's aggro issue by adding sweepers, hard removal, and / or lifegain to the sideboard