Although, in the original, I think the transformation was done by exposure to a bomb blast of some kind?
    
    
      
      Okay, so based solely off the hints (not the name), here are my guesses:
Vision
Captain America
Steve Rogers
Vibranium
Ultron
The Hulk
Hulk
Bruce Banner
Vita-Ray
Mutagen
    
      Vision
Captain America
Steve Rogers
Vibranium
Ultron
The Hulk
Hulk
Bruce Banner
Vita-Ray
Mutagen
      "As rare as the material it's known for". That's the kicker clue, I think.
    
    
      
      Maybe Captain America's shield, or something made out of a material?
    
    
      
      It's made of vibranium.
    
    
      
      @Dragonfire: yeah, the hulk was originally created with fallout from a nuclear bomb
    
    
      
      Money? At this point it's rare in my wallet.
    
    
      
      Isn't it made out of an alloy?
    
    
      
      Vibranium has been tried
    
    
      
      Also, Lady Deathstrike could be a guess.
    
    
      
      I don't think it's a person. I've tried over 40 marvel characters and some DC ones, and I think it's a material
    
    
      
      Nope. Tried it
    
    
      
      I've tried every material on the Marvel Wiki page for Materials.
    
    
      
      Also, guys, we are about to have a new wave of monsters spawn, so get ready
    
    
      Kim wrote:
Isn't it made out of an alloy?
Yes, Vibranium Steel Alloy
      But what -causes- and -takes- mutations?
    
    
      
      *stares at Kim*
    
    
      
      Not necessarily takes away. Just... keeps them in control. Wording is key.
    
    
      
      What about that contraption and stellar storm that made the Fantastic Four? The storm gave and took powers.
    
    
      
      Or suppresses, yeah. We need another word for serum or something
    
    
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