Most played cards in Nicol Bolas, the Ravager:

3 Decks
Chandra, Flamecaller
3 copies - 1 average
Chandra, Torch of Defiance
3 copies - 1 average
Kess, Dissident Mage
3 copies - 1 average
Narset, Parter of Veils
3 copies - 1 average
Brainstorm
3 copies - 1 average
Terminate
3 copies - 1 average
Dack Fayden
3 copies - 1 average
Daretti, Ingenious Iconoclast
3 copies - 1 average
Verdant Catacombs
3 copies - 1 average
Urborg, Tomb of Yawgmoth
3 copies - 1 average
Murderous Cut
3 copies - 1 average
Wasteland
3 copies - 1 average
Wooded Foothills
3 copies - 1 average
Watery Grave
3 copies - 1 average
Collective Brutality
3 copies - 1 average
Counterspell
3 copies - 1 average
Arid Mesa
3 copies - 1 average
Hero's Downfall
3 copies - 1 average
Kolaghan's Command
3 copies - 1 average
Lightning Bolt
3 copies - 1 average