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After running a lot of Whimsicott-GX in the last few days here are my thoughts
It bricks a lot. Too often to be acceptable. It can smash though, mostly two or three prizers. If you don't brick then the ADP/Zacian matchup is great. If your opponent is mostly GX/Vs and you don't brick you're in a pretty decent position. Single prize decks can cuck you, but Blacephalon can't.
Overall meh.