Re-print of an Older card, but an updated view if worth it.

This really is the perfect card for the pack-in hero, Angel. Or more Aptly, Archangel. When played by Archangel, this allows him to use his naturally high defense to shrug off an attack with a ready to still Attack, counteracts the fact he has an Acceleration symbol with threat removal, and uses his ability to do 2 damage. While this isn't the biggest hit, it has a low enough cost to still be able to switch over to Angel and use another card to get that card draw, in particular with all the other crafty tricks and reductions that could have this popping right back into hand, or only taking a single resource card to play.

With the Addition of "The Power of Flight", this card becomes much more attractive in general, as there are just more resource options for you to build with and use to mitigate it's cost. While the Aerial trait requirement is restrictive, there are more and more heroes that just have the trait printed on the card and don't need to "find" it.

Extremely good card for Protection Thor (who becomes Aerial thanks to Mjolnir), or Spectrum in Gamma form, granting 2 threat removal plus at least 3 damage for 3 ER, an astonishingly good ratio (compare with Hit and Run which only grants 2 damage and 2 threat removal for 4 ER).

Obviously good for Angel as well, who draws a card when playing it, and for Nova, who relies on basic powers to generate resources from his Supernova Helmet, less so for Ironheart who, even if Aerial from the start, has lower basic stats and no particular need of readying herself often.

Many other characters can benefit from this card (Captain Marvel, Iron Man, Wasp, Star-Lord, Vision, War Machine, Valkyrie, Phoenix, Storm, Rogue, Magneto), although none of them is Aerial right from the start like the ones I mentioned above and thus have to rely on cards that make them become so. Personally, I wouldn't include Aerial cards in these characters' decks if I have to rely to a lucky draw, except maybe Iron Man and Magneto who have the means to tutor the cards that make them Aerial.

However, special mentions go to Doctor Strange, who gains Aerial from his Cloak of Levitation and loves to ready himself so he can cast more invocations, and Iceman who gets Aerial with his Ice Slide and loves to use his basic powers to attach more Frostbite to his enemies. If you play these characters with the Protection aspect, Ever Vigilant may be worth including.