chilling reign pokemon booster box - Sword & Shield - The Chilling Reign expansion is inspired by the frigid lands of the Crown Tundra Chilling Reign Booster Box :

Also, I am only counting creatures, not tribal spells

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Wait for stable market trends

In a Red-Eyes archetype deck, you can substitute Dark Magician for a card like King of the Swamp that treats itself as Dark Magician (or any other specifically named card) for a Fusion summon

There are restrictions on the X materials, but I think X Summoning is easy due to the existence of Silent Anglerand Tin Goldfish