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One of the rarest is the Cyber Dragon from the Preview Wave 1 of Duel Terminal

It is estimated that Wizards of the Coast printed about 110 total copies of Splendid Genesis, and only a few have appeared for public sale

Golbez, Crystal Collector is one of the few non-white artifact angles, so maybe UB splashes this after you open it

Control is the least common place to find a gush as they rarely want to lower their land count but it does provide unique options for them and is fine as a card to pitch to Force of Will etc or just hard-cast late game at the end of one of their turns in which you didn't need to counter something