I kid you not: if I had to pick just one Lego set ever made, this epic transforming castle packed with clever details and play features would be the one. I sold off my airsoft guns to afford the $400 set at launch — now, Lego has it on backorder for $300 alongside the awesome Loop Coaster (also $300) and UCS Razor Crest ($420). I’ve never seen this one on sale before.

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