mtg the dark cards Magic: Gathering Ritual [Alpha Edition] Graded CGC 7.5 Ne – Digital Heroes Then shuffle your library Sauron, The Dark Lord 301

It's even more busted that it doesnt have a mana cost to activate

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Of course, there's also Gix, Yawgmoth Praetor's activated ability which can serve as a powerful lategame finisher: 7 mana is a ton for this deck and you need a full grip of cards to consider it, but exchanging a full grip of 1-mana 1/1's and Swamps for your opponents better cards is a great way to overwhelm the table

I should note that my honorable mention could easily be given to the old dual land Underground Sea