The Presentation Blastoise card sold in January 2021 for a cool $360,000 / 260,000 at auction, and while it's since been surpassed, at the time it clinched the title for most expensive Pokmon card ever sold
Emry, Lurker of the Loch There are plenty of good mono-blue artifact commanders to choose from, but Ive always enjoyed how easily Emry, Lurker of the Loch, one of the best affinity commanders, makes it to get your destroyed or milled artifacts back
It's a mana sink, and if your dork brings mana with it, like Priest of Gix, then you can make infinite blinks and then many more combos too
The Deck Vault LX 200 is similar but holds 2 decks
Players sometimes justify its inclusion through logic such as "If you mill six cards from your own deck, and the only flashback card that you turn over is a Think Twice, you're still going to be even on cards." But in green-blue-black mill-yourself decks that are actively looking to get as much of their library as possible (and in some cases all of it) into their graveyard, finding ways to continue to mill yourself is absolutely crucial