I saw a lot of people using Iron-man in battle threads on Vine.A lot of them puts Iron-man in a battle with foes stronger than him but are giving Tony prep time to see can he use it to beat that stronger foe (usually it's about Hulk and Thor).So I want to ask you this,how effective his prep can be,who is the most powerful foe you can think of that Tony can't beat with full knowlege and prep,who he can't beat with prep,what do you ussually think of him using when you say he can win with prep (make a divice or a special armor...)?It is not allowed for Tony to find cosmic cube,infinity gem,odin-force krystal or something during his prep to win.He can use alien tech if he used it in the past.

I also have one more question:If Lex Luthor and Batman can use prep to beat Superman/Justice League,why Iron-man can't do the same thing?

I dunno who's the most powerful being he can take down with prep, but I definitely think he can take down Hulk or Thor.

A lot of people just don't see Tony as a prep master because they think everything he can do is failed armors, like Thorbuster and the many Hulkbusters, none of which took down their adversary. Sadly it's as simple as that, they don't take into consideration things like Sol's Hammer, time machine or the Stark Sentinels.

@amazingfantasy: Or Genetic Distruptor.

@krleavenger: Yes, also impressive. It took down even the Sentry and it wasn't even specifically designed for him.

There's also lesser-known examples, like a defense system that immobilized the Avengers, including Thor, Vision and Iron Man himself. Or the Z-gun, that took down the Silver Surfer.

@amazingfantasy: Really? Never heard of it. Do you have scans?

@krleavenger: Yes, there ya go.

And

Hahahahahahahaha!!!!!!