★ Ursus Knife | Rust Coat
The ★ Ursus Knife | Rust Coat is a Covert skin from the Prisma Case and Prisma 2 Case. Unlike most finishes, its float range begins at 0.40, meaning every available copy starts at Heavy Worn or worse, and the knife intentionally represents a relic from Siege where exterior surfaces have rusted over time. The tanto-style blade's faceted profile holds the rust texture well. Float extending to the full maximum of 1.00 means Battle-Scarred copies show extreme corrosion. StatTrak versions are available for this weathered finish.
Cheapest wear we have on this page. Pattern / float overpay is extra.
Prisma 2 Case: (case+key) ÷ drop chance. Average, not a promise.
Covert / missing collection peers: no contract estimate.
Price History & Performance
Price by Wear
★ Ursus Knife | Rust Coat cannot roll Factory New, Minimal Wear, Field-Tested because its float cap is 0.4–1. Wear ranges.
Cases & Drop Odds for ★ Ursus Knife | Rust Coat
Probability of unboxing this skin per single case open, expected number of opens until you get one, and the case's expected return based on the current market value of every skin inside.
| Case | Drop Chance | Expected Opens | Open Cost | Market EV | EV vs Cost |
|---|---|---|---|---|---|
 Prisma 2 Case | — | — | $4.74 | $0.65 | -86.3% |
 Prisma Case | — | — | $4.75 | $0.65 | -86.3% |
Drop chance = official rarity odds ÷ size of that rarity pool inside the case. Market EV is the probability-weighted average of every skin's lowest current listing. "EV vs Cost" compares that EV against the case + key price — negative means opening loses money on average.
Where to Buy ★ Ursus Knife | Rust Coat
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