The White House just announced that it believes Iran's response to Israel is imminent. Ballistic Missiles would definitely be a pretty significant escalation by Iran since when they launched their last attack it was a missile/drone mixture. Given the significant degradation of Hamas and Hezbollah's missile launch capability, it seems to me that Israel really only has to focus on an attack from Iran as opposed to an attack from multiple fronts at once.
The big thing that comes to mind is the price of oil. Right now it has been low in the mid 60s. When Israel was last attacked in the 70s the price of oil tripled and while that likely would not happen oil could fly to over $100 if the scope and sophistication is another step up as many believe.
Coupled with the East and Gulf Coast Port strikes this would serve as a huge inflationary event that would nuke what Fed Powell said just yesterday!
UPDATE:
This announcement by the White House is due to intelligence-detecting Iranian assets and systems moving (meaning they are moving into position for an attack) something that was previously not seen. Iran wouldn't move its weapons systems into position to attack without an attack coming as they have said they are going to "get" Israel for its attacks and posturing would only make Iran appear weaker without an attack.