Source: marvel.wikia.com

2. Phoenix Killer Armor

Look, the X-Men are coming to the MCU in some capacity at some point (even if not fully) and if that's the case, Tony's going to need to break out this old beauty out and give it a spin.

Originally, this suit was designed during the Avengers vs X-Men event so Tony could fly into space and punch the phoenix force away from earth. This did not work.

It split the Phoenix Force into five pieces and led to a bunch of BS we're not going to talk about right now. But more importantly it's a big suit of space armor that exists to punch a space bird god made of fire. That's pretty rad as hell.

Admittedly, Phoenix wouldn't be the first thing to cross into the MCU but Tony needs to be prepared, what with all the other space-born threats bouncing around out there.