Wha?

I don't get it. IronMan is now Isreali? Why does he keep changing?

The chess world is ONE big world, who cares about flags.

maybe he is a jet-setter, and he uses the flag of the country he is in at any given moment. or perhaps the initial letters of the countries whose flags he uses will spell out a message...

Maybe he found his inner jew (ish person *edit*)?

Well, he is in the Jewish Clan.