Turn the crank for a little ETH. The next block picks a gumball from what's left in the machine, and it rolls straight out.
500 in the machine. 450 plain, 40 striped, 9 glitter, 1 diamond. You can see them all through the glass.
Turn the crank. A little ETH: 80% goes into the pot, 20% buys $GUMBALL and burns it.
What rolls out pays. Striped 1% of the pot, glitter 5%, diamond 25%, straight to your wallet. Plain is just gum.
Every turn changes the odds. Fewer gumballs left means better odds on what's still in there. When it's empty, it refills.