Most played cards in Karlov of the Ghost Council:

4 Decks
Kambal, Consul of Allocation
4 copies - 1 average
Mother of Runes
4 copies - 1 average
Auriok Champion
4 copies - 1 average
Soul's Attendant
4 copies - 1 average
Temple of Silence
4 copies - 1 average
Shizo, Death's Storehouse
4 copies - 1 average
Urborg, Tomb of Yawgmoth
4 copies - 1 average
Stoneforge Mystic
4 copies - 1 average
Phyrexian Arena
4 copies - 1 average
Swords to Plowshares
4 copies - 1 average
Vindicate
4 copies - 1 average
Dismember
4 copies - 1 average
Demonic Tutor
4 copies - 1 average
Anguished Unmaking
4 copies - 1 average
Umezawa's Jitte
4 copies - 1 average
Shambling Vent
4 copies - 1 average
Soul Warden
4 copies - 1 average
Scrubland
4 copies - 1 average
Godless Shrine
4 copies - 1 average
Isolated Chapel
4 copies - 1 average