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They aren't the only ones, but they're good examples, and can get you thinking in the right direction as to what deck you play and how

Echo of Eons Echo of Eons costs 6 mana upfront, which is, again, a lot for a wheel, but it also has great synergies thanks to flashback

C Common Dark Magician Girl the Dragon Knight X DARK Level 7 [ DragonFusionEffect ] ATK 2600 DEF 1700 "Dark Magician Girl" + 1 Dragon monster Must be Fusion Summoned with the above Fusion Materials or with "The Eye of Timaeus"

Umbreon ex SIR 161/131 Finally, I doubt anyone will use an $1200+ Umbreon ex SIR in their decks, but if you take a look at that mental moveset, you'd surely be tempted