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And then there are some that are rare because of both facets

Talk amongst yourselves

[2] Once per turn, when your opponent activates an effect (Quick Effect): You can Fusion Summon 1 Warrior or DARK monster by shuffling materials from your hand, field and/or GY into the Deck

Having the support of two formats is no joke, as Tarmogoyf and Dark Confidant can attest to

Monsters like Galaxy Wizard and Radius, the Half-Moon Dragon have effects that allow them to increase their levels to Level 8, while spell and trap cards such as Rank-Up-Magic Cipher Ascension or Constellar Belt are designed to bring out even stronger XYZ monsters or protect your Galaxy-Eyes monsters once theyre already on the field