I know Im not alone in hating the idea of Jace & co planeswalking into the events of Lord of the Rings , and so I dont think its too much to hope that this set might be self-contained and even function as a booster innovation product like Battlebond or Conspiracy
Both existed fairly well as they dont explicitly overlap, but Gitrog was just more popular and slowly Mazirek simply became a fixture of its deck
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Surging Sparks and Destined Rivals at MSRP If you can find either of these at retail price ($95$100), they're excellent value for ripping
If the rest of the bonus sheet is like this, it will provide needed reprints without unbalancing draft and sealed games with extra bomb rares
However, the balance of these cards is implicit in their low HP for Pokmon ex (only 140 HP), as well as in the multiple options we have to remove them from the Active Position with control cards such as Sabrina or Cyrus