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|
|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|
|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.