Based on the presence of Tezzeret in the key art so far, and the revealed box for the Counter Intelligence Commander deck, its looking like artifacts could be a significant theme in Edge of Eternities
Double dragons are great, even if youre just duplicating 5/5 fliers
It has enchant land and "Enchanted land has ': Add one mana of any color.'" Whenever Preston Garvey attacks, untap each enchanted permanent you control
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However, in terms of mana production, things are much more balanced, with 22 black pips, 18 green pips and 15 blue able to be created via lands and Arcane SignetArcane Signet, our single, lonely mana rock capable of making colored mana