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
If you collected Pokmon trading cards as a kid and happen to have any still knocking around gathering dust, you could be about to to find yourself better off
Honorable Mention #2 Sakura-Tribe Elder There was a time when I think we would all seriously consider an argument that STE was one of the top five land fetchers of all time
It's a well designed card for the kitchen table
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