Thor can be pretty strong once he's set up, but with a base 5/4 hand size, it can take a while to even find your cards. For Asgard! transforms itself into another one of your key pieces for a mere one resource, helping you set up that little bit faster. Look to grab Asgard, God of Thunder, or The Bifrost, probably in that order.
It also recurs cards out of your discard pile, so if you lost one of those key cards to a Treachery, or you just want another go with Throg, it's good for that, too.
This is a fantastic card that joins Air Supremacy as a good reason to pair Leadership with your Aerial hero. They play well together, in fact, since Supremacy helps you dish out damage if minions are your threat while Cloud 9 gives you a burst of thwarting to answer multiple schemes. Cloud 9 plays well with ready effects such as Command Team or even Get Ready since her pump ability doesn't damage herself. Whereas these ready-ing cards usually don't provide extra value and just speed up your ally's uses before they die to consequential damage, Cloud 9 actually gets extra activations from them.
Look to Adam Warlock, Falcon, or Captain Marvel to fill out your Aerial allies. Falcon, Vivian, and Snowguard (on 2) are additionally Champions which may help your other synergies.
Has to be built around for good effect, but a solid card!
Go All Out has the potential to be the highest damage attack in the game, and its in leadership of all aspects!
The energy resource requirement is fine on a 2-cost card, but exhausting your hero as a cost means we need to compare the overall damage of this card versus the opportunity cost of missing a basic attack power. Generally the lower a hero's ATK and the higher their THW and DEF, the better this card will be for them.
Damage can obviously be increased using stat boosts. (Remember that ATK boosts would also increase a basic attack.)
3 Damage Base: Ms. Marvel, Quicksilver
4 Damage Base: Adam Warlock, Drax, Hawkeye, Iron Man, Nova, Rocket Raccoon, Spider-Ham, Valkyrie, Wasp (tiny)
5 Damage Base: Captain Marvel, Colossus, Doctor Strange, Spectrum (energy form included), Star-Lord, Thor, War Machine
6 Damage Base: Ant-Man (tiny), Black Panther, Black Widow, Captain America, Gamora, Ghost-Spider, Groot, Hulk, Ironheart (version 1), Nebula, Shadowcat, She-Hulk, SP//dr Suit, Spider-Man (Miles Morales), Spider-Man (Peter Parker), Spider-Woman (including Superhuman Agility for playing the leadership card), Venom, Vision (Dense)
7 Damage Base: Ant-Man (giant), Ironheart (version 2), Wasp (giant)
8 Damage Base: Ironheart (version 3)
Conclusions:
Averages 4 damage for 2 resources when taking into account missing a basic attack. This is not terribly impressive on the surface but it does scale exceedingly well with supporting cards.
Spider-Woman has the highest non-infinite damage potential, currently her magical Christmas land damage number can reach 58 damage, or 64 with Doctor Strange helping. The actual number would be a lot less but it is still possible to one-shot a villain stage without gimping the entire deck.
Ant-Man, Spectrum, and Wasp are all even better than they seem because they can very easily trigger Moxie.
Quicksilver was already using leadership for OTK combo plays and this leans even further into that.
Yet another reason Doctor Strange loves the leadership aspect, as it gives him high burst damage with his Magical Enhancements that he previously was not really using.
Finally, steer clear when using Venom because the opportunity cost needs to include not using his two Venom's Pistol on his basic attack. It is also exceptionally poor for Ms. Marvel who needs to give up her Morphogenetics.
To the Rescue! is fairly inefficient at thwarting, getting you a mere 2 thwart at a cost of 2+card. Justice is loaded with thwarting events that are cheaper or more effective, and Leadership has tons of allies that can thwart for 2 and then do something else (block). Even Aggression has events that are cheaper and conditional (Chase Them Down) or expensive but much more impactful (Into the Fray). But sometimes you're playing Protection, and your options for adding Thwart to your deck are slim, so you gotta make do with this.
Plan B allows you to convert spare cards to damage, without being an attack. This can be either a blessing (if you're stunned, or Intangible) or a curse (if you were wanting to clear that stun).
Note that this is a fairly inefficient way to convert cards to damage. Two damage for one card is fine, but since you have to pay 1+card up front before you're allowed to start making that trade, it really only breaks even after about five uses (1+6 cards for 10 damage).
Might be best in Protection or Justice, as Aggression and Leadership tend to have better access to efficient ways to put out damage. And as hinted above, could be good for Vision if you're planning on spending a lot of time in tank mode.