Of course every sunni nation counts Iran as an enemy. But as for being a common enemy, one could just as accurately say that Iran and Israel have a common enemy in Saudi Arabia, Turkey, And the Gulf States.
I don’t believe Israel considers Saudi or Turkey as enemies—at least not any kind of current threat. From everything I have read, Iran is by far the one they are more concerned with. Hence ISIS may be playing a useful role in the opinion of Israel and Saudi.
OF course Bibi hasn’t called me recently to tell me what is on his mind.