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It makes it into this deck for its impressive ability, Rough Skin

It is essentially a backup combo piece in the Reanimate decks that doubles up as disruption

Its attack is also incredibly efficient, as it only requires one energy to be used, and it deals 40 damage, making it perfect for dealing with pesky cards like Budew

While I considered trying to build the deck in Standard (and you can definitely build a deck with four Duskmourn's Claims and hope for the best), too many cool cards that I wanted to play with don't exist in the format

If you only care about non-Standard Constructed formats (like Timeless or Historic) and dislike drafting, then no the Mastery Pass probably isnt a good idea because it rewards Standard packs (which you don't have much use for) and a Draft token (which you don't enjoy playing)

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