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The Butterfly Knife is one of the rarest and most desired knives in CS2. You can get it through the trade-up system, where 5 Classified skins are exchanged for one rare item, or by opening CS2 cases.
Breakout Collection: 5 CS2 skins from this collection guarantee a Butterfly Knife (e.g., P90 Asiimov, M4A1-S Cyrex).
Other Collections (Dreams & Nightmares, Spectrum, Spectrum 2, and Riptide): chances drop significantly — from 0.16% to 3.33%, especially when mixing skins from different collections. Rare knives here tend to be more expensive.
Tips
Use identical StatTrak skins to maintain your chance.
Mixing collections lowers the probability of getting the knife you want.
Conclusion: For the best success, use 5 skins from a single collection, preferably Breakout. Other options are riskier.


