These decks are shared by the community and already available to pick in any game lobby, so there's no need to clone one just to play it. Clone a deck only if you want to customize it or use it as a starting point for building your own.
The Celestial Toymaker
Ultron, Artificial Malevolence
Ghalta, Primal Hunger
Lynde, Cheerful Tormentor
The Ur-Dragon
Sidar Jabari of Zhalfir
Aeve, Progenitor Ooze
Alela, Cunning Conqueror
Aurelia, the Warleader
Rin and Seri, Inseparable
Atraxa, Praetors' Voice
Smaug the Impenetrable
Fire Lord Azula
Athreos, God of Passage
Vren, the Relentless
Giada, Font of Hope
Darigaaz Reincarnated
Rat King, Verminister
Kaust, Eyes of the Glade
Katilda, Dawnhart Prime
Brokkos, Apex of Forever
Raffine, Scheming Seer