If my opponent use Art of seduction , can i change my plot with bran stark the next plot phase?

No. Art of Seduction prevents you from revealing a new plot in the next plot phase. And that covers all mechanisms for revealing plots. Interestingly enough, you can use Bran in the same plot phase during which Art of Seduction is revealed, though.

ktom said:

so use him immediately to reveal something to pwn face for two consecutive rounds (to the spears).

edit: or maybe something that could legally be used in the same deck with bran. either or.

So you are running Bran Stark ooh in Martell? Seems legit…

Running Braavos and Norvos will compensate the ooh penalty. And you can always use the influence.