Open the Winter 2018 case on TF2Royal for 0.86 coins. 55 Team Fortress 2 items can drop, each with a published chance and a live market price, and every spin is drawn from Random.org before the reels move.
The 40 most valuable of this case's 55 possible drops, with the published chance and live market price of each. The full table is listed on the page itself.
One spin of the Winter 2018 case costs 0.86 coins and draws a single item from the 55 listed above. You can open one at a time or up to four at once; four spins cost four times the price and are four independent draws, not one improved one.
Whatever drops is credited to your balance at its full value in coins. You can spend that on the marketplace, stake it in any other mode, or buy the item itself and withdraw it to your Steam inventory.
The Demo button spins this exact drop table without spending anything, so you can see how the case behaves before committing coins to it.
The winning ticket is drawn from Random.org before the animation plays, and every finished spin carries a Verify button that opens the record behind it. Random.org stamps each request with a serial number that only ever increases, so a quietly re-drawn result would leave a gap in the published sequence.
This case is rated ultra volatility. That describes how swingy its payouts are relative to its price, not how generous it is: it blends how often a spin returns less than half the 0.86 coin price with how large the top drop is against it.
Bread Heads Burning Flames1,350.000.002% 
Millennial Mercenary Vicious Vortex765.000.003% 
Dumb Bell Vivid Plasma112.500.018% 
Strange Polar Pal21.320.025% 
Strange Puggyback3.250.138%