Common

By default, this move already Taunts all enemies in an area, but when upgraded it also inflicts Weak on them.

Rare

Already a great card but when upgraded, it gets exponentially better as it also gives him Counter. Recommended to use it in combination with The Best Defense.

Rare

In Midnight Suns it's actually not all that common to find cards that give allies Block, so this card is very helpful.

Common

One of her most basic moves, but a crucial tool for building cheap and immediate Block.

Common

With this upgrade, the already overpowered Photon Beam does everything it already did, but better.

Rare

Having Counter and Resist active at the same time is one of the most overpowered combinations out there.

Common

This card is where a lot of people get confused with Dr. Strange's playstyle and switch off him, and it's a shame. Basically, it's a fantastic card to set up for the next turn.

Rare

This is one of the rare cards that has the Bind status effect. But, when upgraded it also gets Vulnerable, which can trivialize boss encounters.

Rare

A bit basic compared to his other cards, but this upgraded Bolt inflicts a whole lot of pain using either 4 or 8 Heroism.

Common

Since Ghost Rider's whole loop is based around generating these cards, it only makes sense to upgrade them.

Common

Drops are basically anything that an enemy can be 'pushed' to fall into, from a rooftop to a hell portal. And, the percentage of knocking them in successfully is based on their remaining HP. Therefore, upgrading Hellmouth with more damage and the Strengthened keyword is an obvious choice.

Rare

Because players are constantly balancing Ghost Rider's Health as per his playstyle, a healing card is a huge help overall, and this one even replaces him with a Drop.

Common

Just an absurdly useful Taunt tool that also enables Hulk to decimate enemies with Rage-amplified Counter.

Common

Knockback and Stun are some of the game's best debuffs, and being able to apply them in an area can make fights a breeze.

Rare

A fantastic damage and Rage-building tool that works great in combination with Thunderclap.

Common

This upgrade shines most when Iron Man is in a party with other Heroes who are great at pushing the enemies into one big clump (aka Spider-Man or Magik).

Common

Without a doubt, Surgical Strike is Iron Man's best card if the player is fine with his cards hogging all of the space in hand.

Rare

Not only does this card have the option of giving Block to Allies, but when upgraded it also adds to the player's Redraw counter.

Common

By default Magik's Limbo Portals are free to play. But, in the rare instance, a player draws a card or looks at their hand and a Limbo Portal is not there, upgrading it means there are extra benefits to a Limbo Portal on redraw.

Common

Whereas Ghost Rider can create Drops on the map or even replace himself with one for a turn, Magik can do it with enemies and allies using upgraded Banish.

Rare

Gather, at first, may seem like the perfect card to gather enemies all together for one big AoE move (and it is). But most commonly, players use this wide AoE early-game to take care of all the basic one-hit mobs in one card.

Common

Empower is likely the card that anyone who plays Nico gravitates to and for good reason.

Common

While there is the Roulette factor of this card to consider, it only has 4 potential debuffs it can roll between. Players will either get the ability to apply Stun, 2 Marked, 2 Vulnerable, or 2 Weak, and all of these debuffs are fantastic.

Rare

When upgraded, players can strategically use it only when characters are below 50 percent HP to prevent it from being discarded so they always have a heal on standby.

Common

This seems to be Wanda's go-to card as every time she uses it the card and any other Hex Bolts in her deck get +1 Chain, leading to some pretty absurd levels of Chained attacks.

Common

When upgraded and used in combination with Unleashed, this can do some pretty hefty damage to a lot of enemies at once.

Common

When upgraded, this bonus to her AoE range jumps from 25 to 40 percent for 2 turns, which makes a pretty noticeable difference.

Common

Bind is an absurdly useful status effect, especially against bosses, and the extra environment damage is just an added bonus.

Common

Fast reduces the cost of all Spidey's Heroic Cards by 1 for that turn, which is huge. But, when upgraded, he also gets 2 Resist.

Rare

Basically just gives Spider-Man the freedom to do whatever environmental attacks he wants for the next two attacks. When upgraded, it also increases the damage they do.

Common

When upgraded, this actually becomes a great debuff tool through the Full Combo added benefit.

Rare

Similar to Blade's Savage card, this is worth upgrading so that Wolverine has an option for getting rid of enemy Blocks quickly.

Rare

When upgraded, this AoE Taunt and Counter also applies Weak to all enemies in the AoE.