Ironman can call upon all of the help and resources of his fellow Illuminati members( Reed Richards, Dr. Strange, Black Bolt, Prof. X, Beast, Black Panther, Namor) as well as Hank Pym's assistance. He also has access to other resources (uru metal, adamantium, vibranium, other enchanted metals etc.) (along with his own) he has a year to prepare for each of the following:
1. Superman (Pre-New 52 version)
2. Flash (Pre-New 52 version/ Wally West)
3. Martian Manhunter (Pre-New 52 version)
4. Captain Marvel/ Shazam (Pre-New 52 version)
He has an additional two years to prepare for the Silver Surfer with the same set of resources.
Tony's five opponents are aware of an attack by him, they just don't exactly know when or where, they are unaware of his various resources. Fight till K.O. or death. Morals off for everyone. Do you think Ironman can clear it?