This isnt always a huge problem, but can certainly impact things when you wanna cast Eris, but you just emptied your graveyard with Dig Through Time
At the time of writing, it seems collectors are having a hard time seeing eye to eye on the value for this card, with it bouncing between $140 and $260 in listed prices
Most decks run about 1015 Energy cards, depending on how fast you want to go and how much Energy your attackers need
And with her abilities, she will likely become a staple in some mono-blue and dragon commander decks, helping that value grow from her $15 price today
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Depending on a players preferred format, they can mix and match cards from both of these sets to fit their playstyle