Based on the search results, here are the CS2 cases that have Karambits:

• Gamma Case
• Gamma 2 Case
• Chroma Case
• Chroma 2 Case
• Chroma 3 Case

These cases give players a small chance of unboxing a Karambit knife skin, but the knife skin is usually selected at random from dozens of options. The Karambit Marble Fade appears in the Chroma, Chroma 2, and Chroma 3 cases. The Karambit | Case Hardened can be obtained by opening one of the 11 containers that contain the skin, including the CS:GO Weapon Case, CS:GO Weapon Case 2, and CS:GO Weapon Case 3 container.

Its important to note that the odds of getting a Karambit skin from these cases are quite low because they contain many other knife skins. If players want to ensure they get a Karambit knife skin when they finally unbox a knife skin, they should opt for weapon cases full of Karambit skins.