I'm trying to work out the maximum level of cards based on the card rarity to write the wikicode which autogenerates this information when the rarity of a card is defined. Please feel free to supply more information by posting as a comment.
| Card Rarity | Maximum Card Level | Maximum Mastery Level |
|---|---|---|
| Common | 20 | 20 |
| Uncommon | 30 | 25 |
| Rare | 40 (Morbius) | 30 (Morbius) or 125 |
| S Rare | 50 ([Vampire Hunter] Blade) | 35 ([Vampire Hunter] Blade) or 150 ([Legal Eagle] She-Hulk+) |
| SS Rare | 40 or 60 ([Son of Asgard] Thor) | 40 ([Son of Asgard] Thor) or 150 |
|
U Rare |
50 (Black Widow+++) or 70 ([Son of Asgard] Thor+) | 200 ([Son of Asgard] Thor+) or 350 (Black Widow+++) |
| Legandary | 80 [Friendly Neighbor] Spider-Man+ | 250 [Friendly Neighbor] Spider-Man+ |
Update: It seems like there is a pattern but some cards have irregular maximum levels.