Warning: Spoilers ahead for Empyre #6.
In the final issue of Marvel's Empyre event, Iron Man gets an opportunity to save the day despite impossible odds--which ends up being a perfect callback to the most well-known line concerning his superhero origins in the MCU.
When the sun is on the verge of exploding and the Cotati are planning to unleash their Death Blossom, Tony Stark and Reed Richards brainstorm, finding ways to solve both problems at once. While they find a means to stop the Death Blossom, Tony still has to find a way to stop the sun. Reed is initially worried about him, but Tony claims he's in his element, which is where the epic reference comes in.
Empyre began with Tony in a pretty rough place. He rushed into the initial conflict without thinking things through entirely in the first issue, believing the Kree/Skull alliance to be enemies, when the Cotati were the true threat. This caused Tony to spiral a bit, beating himself up about his consistent failings and hubris in always thinking he couldn't possibly ever make a mistake. This event seems to be a real tuning point for his character as a result. Reed joins him in his workshop, and helps him regain his focus. Together, they build Reed his own Iron suit which can adapt to his stretching powers and also emits specific sonic frequencies to bio-acoustically mess with the Cotati's powers. Before Reed left Tony, he was unsure if Tony could come up with a solution for their other problem with the sun, unsure whether or not Tony's himself. However, he eases Reed's fears in a pretty cool way.
Tony is essentially equating their current predicament to his origins not only as Iron Man, but as a better person in general, when he truly became the Tony Stark he was always meant to be. Even better is the inclusion of the "cave of scraps" line, which is a reference to the first MCU Iron Man film. When Tony came back to the U.S after escaping the Ten Rings terrorist organization, he only told a few people that he built his own arc reactor powered suit to fight his way out. One of those people was Obidiah Stane, who was the one to hired the Ten Rings to kill Tony in the first place, unbeknownst to Tony at the time. Recognizing the power and financial opportunity, he immediately puts engineers to work on recreating the suit, but they struggle to replicate Tony's work. Angered, Obidiah exclaims that Tony was able to build his armor in a cave with a box of scraps, the implication being that it should be easy for them with all the resources of Stark Industries. Apparently not.
It's an excellent reference to the MCU, one of a few that can be seen over the course of Empyre. While Empyre doesn't actually feature Tony suiting up as Iron Man after the first issue, it seems as though this was pretty intentional and a good thing, creating an event where Tony's battle was just as much internal as it was external. In the finale, Tony does his part to save the day, providing the means the remove the denser material in the sun's core (such as iron) to provide a balance, thereby preventing the sun's explosion. Removing the iron solved the problem, which is a pretty dang good metaphor for Iron Man all things considered.