If you want to ignore languages (as most other counts of this problem on the internet do), you get 38,768 mechanically unique cards
Urborg, Tomb of Yawgmoth Okay, first order of business is getting our Swamp on for the Swamp King, and the best card for doing that is Urborg, Tomb of Yawgmoth
1 Land card (Traditional Foil Land replaces a Land in 20% of boosters)
From humble beginnings playing Ayli, Eternal Pilgrim with some janky-ass combos, to Teysa Karlov, Regna & Krav partners, Nalia deArnise and other precons, both Liesa, Shroud of Dusk and Liesa, Forgotten Archangel (two very different decks), Ive tried many different styles
Sure, its not a hard counter like Dispel or Muddle the Mixture, and it cant counter noncreature permanents like Negate
We did a great job of flavoring the clans, creatively and mechanically