From patch notes:
The number of Mysterious Marks you collect during a Ceremony of Chaos cycle can be checked by using the /ceremonyofchaos command in the chat window.
However the command that works to check this number is /festivalofchaos
Anyway, it's pointless to enter cos the last players always are tanks and healers and can't kill each other. Atleast make it like oly and no1 have biffs inside or chose only 5 buffs (exactly like oly)