Iron Man - Rainmaker

Mulligan everything that doesn't help get your resource generators running. Never play a second Rocket Boots unless you plan to sacrifice it to an effect immediately after (far more effective to use it as a resource that Stark Tower can repeatedly fetch). Generally you'll be wanting to spend your excess energy on all the damage you can afford mid-to-late-game, and this build enables that while Tony is repeatedly thwarting everything that comes up.

Hulk's debatable, I'm lukewarm on him and keep swapping him out for Haymaker or Combat Training to put on a teammate. I think he could be viewed as a 2-cost 5+ heal right now though if you chose to block with him, which is a better deal than the First Aids (or paying 2 for 3 and him to just calm down).