I think it's best to start a different thread for each hero. Easier to keep track of changes and stuff like that. Overall though, I like your approach.
Card Name: Lights, Camera, Action
Card Type: Might
Card Text: Avenger: +3 damage
This seems really powerful for a common card. Do you know of any other common cards which cost 5 and can provide up to 6 attack?
Card Name: Movie Star
Card Type: Instinct
Card Text: You gain 1 Recruit for every Bystander in your Victory Pile/
Ooh, I like it! Basically, it's Black Widow's "Covert Ops" but for recruit instead of attack. I'm surprised nobody thought of that before, at least to my knowledge. You might want to consider putting a limit on it though.
Card Name: Tempermental
Card Type: Instinct
Card Text: Each player may gain a Wound and discard a card; then each player may draw two cards.
Origin Idea: This is more of a classic look at Havok compared to his new Avengers leadership roll, but he used to make dangerous quick decisions because he wanted to be more like Scott.
I've always liked Havok, but, man, he's seemingly always gotten the short end of the straw. Marvel has screwed him over more times than I can count. I prefer his X-Men days with Lorna (Polaris) and his stint as the leader of X-Factor. Anyway, I like this card's effect. You might want to tweak the wording slightly. I would change "then each player may draw" to "if a player does so, that player draws". Consider the case where a player has no cards in their hand to discard or if there are no Wounds left in the Wound deck. Consider also synergies with Colossus and Cyclops' uncommons, which you may or not want to facilitate.
Card Name: Cosmic Energy Charge Up
Card Type: Ranged
Card Text: Teleport. If this card was teleported last turn it does +3 damage this turn.
Origin Idea: While Havok does not have a teleport power in comics I could not think of how to display his slowly charging up to unleash a more deadly attack.
Interesting! It makes a good case for a new keyword... Maybe instead of the Teleport effect, you put the charging card on top of your draw deck?