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.
Be'lakor, the Dark Master
Anti-Venom, Horrifying Healer
Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel
The Ur-Dragon
The Valeyard
Aphelia, Viper Whisperer
Tovolar, Dire Overlord // Tovolar, the Midnight Scourge
Omo, Queen of Vesuva
Captain America, Team Leader
Akiri, Fearless Voyager
Elas il-Kor, Sadistic Pilgrim
Falco Spara, Pactweaver
Georgiou, Terran Emperor
Raff, Weatherlight Stalwart
Slivdrazi Monstrosity
Ob Nixilis, Captive Kingpin
Hugh, First of Many
Krang, Utrom Warlord
Captain Howler, Sea Scourge
Ayara, First of Locthwain
Niv-Mizzet, the Firemind
Jetmir, Nexus of Revels
Queen Marchesa