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First off, Eidolon Summon Magic has an extra clause allowing you to Fusion Summon using monsters from the graveyard as well, similar to Miracle Fusion, but also allowing you to use monsters in the opponents graveyard

Both forms can be Xyz Summoned by overlaying their base forms through Chaos/Shining Xyz Change (Xyz Evolution)

Theres two especially Johnny moves I can see here, though: the first is to name Sliver with Rukarumel to weave Slivers into another more traditional creature-theme deck

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If you want to save some money, keep an eye on what is performing well at the tournament, because there's a good chance that the key cards in the breakout deck will see a meaningful price increase