Catelyn Stark : "While Catelyn Stark is participating in a challenge, your opponents cannot trigger card abilities"
Cersei Lannister : "While Cersei Lannister is attacking during an Intrigue challenge, raise the claim value on your revealed plot card by one"
What happened if i launch an Intrigue challenge with Cersei ?
Does the claim is raised or not ?
thanks for your help
Cersei's ability is a (conditional) constant, not a "Triggered" ability - which is specifically defined in the RR on p22: A triggered ability is any ability with a boldface precursor followed by a colon and the rest of the
Catelyn does not prevent Cersei's ability.
For more on what Catelyn does and does not prevent, check out the community FAQ here.