Why is nobody talking about Cable?

After he completes his Technovirus Purge (possibly even on round 1), he's already dealing 9 (!) damage with this card. Give him a Morale Boost, a Moxie, or let him Lead from the Front and it's 12 damage. Play all of those at once to really go nova and deal an unbelievable 18 damage. Still not satisfied? Put the guys in your R&D Facility to work to add 2 more damage to the total.

And it all makes wonderful sense for those who know Cable and his (very convoluted) history...

I can't believe this guy is worthy of Wielding Mjolnir

Sorry Thor.

Aren't all you folks that were bitching about Captain America's Shield not having the WEAPON trait back in the day happy this didn't happen to you? lol

This card has simply been outclassed by so many other Protection cards (Jump Flip, Hard to Ignore, Not Today!...) that at this point nothing in the game can save it from oblivion. A conditional 1-2 threat removal (I'm not really considering 3, since you can only reliably get it if you're playing Phoenix, Spectrum in Photon form, or max level Ironheart) for 2 ER is just too low. For reference, compare it with To the Rescue!, which is a Basic card with a non-conditional threat removal / ER ratio of 0.66, and with Chase Them Down which is an Aggression card with a conditional threat removal / ER ratio of 2.

Also, it's a THWART Event, not a DEFENSE, so it cannot benefit from cards like Flow Like Water, Defensive Energy, or Nerves of Steel.

To solve all of its problems, I house-rule it as a 0-cost card. This makes it a thwart with a conditional threat removal / ER ratio of 1-2, which is either acceptable (if it's 1), good (if it's 2), or very good (if it's 3), but never too good since it's conditional.

With this card, we now have 4 Protection cards that do ALMOST the same thing with finicky differences, the other three being True Grit, Jump Flip and Hard to Ignore.

True Grit is probably the worse of the quartet. For 2 ER, you remove at most 2 threat (well, 3 if you're playing Phoenix, Spectrum in Photon form, or max level Ironheart), which is a mediocre ratio. It also hasn't any particular synergies with other Protection cards, since it's a THWART Event, not a DEFENSE. The silver lining is that you're not limited to removing threat from the main scheme, but it's not saving the card from utter mediocrity.

Jump Flip and Hard to Ignore are arguably on par with each other, each suited to slightly different scenarios but also capable of synergizing well with each other. Jump Flip is more flexible as it's not dependent on defending using other means than itself, but it has an annoying energy resource requirement (which nevertheless works well with Nerves of Steel), while Hard to Ignore has a better threat removal / ER ratio in the long run but has a no-damage requirement that makes it better suited for high-defense heroes who like to defend a lot, in conjunction with Armored Vest, Expert Defense, Desperate Defense, Never Back Down, or Riposte. However, the big drawback here is that both only remove threat from the MAIN scheme, which sometimes can be very limiting.

Personally, I think that Not Today! is the best of the four. It's similar to Hard to Ignore in terms of what it does and how (and in fact it benefits from the same card synergies), but it's not limited to removing threat from the main scheme, intrinsically helps you reach the no-damage requirement, and it's a DEFENSE Event which benefits from cards such as Flow Like Water, Defensive Energy and Nerves of Steel. It synergizes well with its three brothers, but I would never include all four in the same deck (certainly not True Grit, and I would choose Jump Flip over Hard to Ignore only if my deck reliably provides a lot of energy resources and/or my hero isn't very good at avoiding damage entirely). Combine with Bait and Switch if you're playing Solo against heavy-scheming villains, or in multiplayer to be hailed as the definitive support hero (especially if there are no heroes with the Justice aspects).

I am surprised that this card has no reviews yet!

For me, it's an auto-include in any Aggression Thor deck. Thor becomes Aerial thanks to Mjolnir and loves to use it to take a Mean Swing or a Skilled Strike against the bad guys, so this card is basically a much better Jarnbjorn with improved resource efficiency (damage/ER ratio of 2, on par with Hand Cannon), AND you can play it for free with Team-Building Exercise since it shares the Aerial trait with you (EDIT: most likely you can't do this, see discussion below).

If you happen to have Mean Swing, Skilled Strike and Pitchback in your hand, you can turn a basic attack into a 12-damage wallop for only 4 ER, which is amazing value! 3 copies of each of those cards are enough to defeat both stages of most villains in the game when playing Solo.

Of course it's good for other Aerial heroes who attack a lot, like Nova (it's in his pre-built deck for a good reason) and Spectrum, and obviously super good for Aggression Angel who draws a card after playing it, slightly less so for Aggression Ironheart who doesn't attack as often. Grab it together with Dive Bomb and you'll have a solid backbone for any Aggression deck based on those heroes.