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Dhelmise and Chi-Yu Last but not least are Dhelmise and Chi-Yu
Value averages around $450 but thats +/- $100
(Although I should note that we do push these decks to fringe levels every once in a blue moon.) Utility discard cards, on the other hand, do not necessarily promote the discard decks unto themselves (although they are used if enough resources for the discard deck exists)
Its possible Merfolk still wont have what it takes to be a top tier Pioneer deck, but Cenote Scout is a large upgrade, nonetheless
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