its cool and all, i only have one master transmuter in my sphinx deck as well, and yet it seems to work well because of arcum dagsson. You might want to look into cards like that and use it to pull out regular artifacts.
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*ALL COMMENTS ABOVE DO NOT AFFECT THIS NEWWER VERSION OF THE DECK*
i can always switch the pentads out with another artifact with the master transmuter and then bring it out with two counters again to produce two mana of ANY COLOR to my pool.