If there is any chance at all it could occur...eventually it would occur.
This is simply not true and demonstrates how evolution confuses people who don't discern how "chance" accumulates.
Let me demonstrate as concisely as I can.
In order for a beneficial mutation to occur, a certain number has to be rolled on an enormous roulette wheel with millions of numbers—not just once—but time after time.
Remember, you can't have one hand and then simply expect to have all of the necessary mutations form a second hand in perfect symmetry. This is clearly absurd.
Remember, a hand is not just a hand. It is muscles, ligaments, bone, cartridge, nerves, arteries/veins, and much more in intricate design.
This intricate concert of symmetry requires mutation after mutation after mutation, not just in perfect form and proportion, but in the right order.
Now, pile on that the problem of irreducible complexity. There is no way all the steps—even if they could occur—would be beneficial. No chance.
Furthermore, the probability of the sequence of events happening in the right order depletes chance to beyond absurdity.
Then, you have to hope that no destructive mutations take place during the development of some useful part that would destroy it's form, and we all agree that harmful mutations are far, far more abundant than beneficial ones.
Evolution is a mathematical absurdity. You really need to open your eyes and see the big, pink elephant in the room.
"... Why, if species have descended from other species by insensibly fine gradations, do we not everywhere see innumerable transitional forms? Why is not all nature in confusion instead of the species being, as we see them, well defined?… But, as by this theory innumerable transitional forms must have existed, why do we not find them embedded in countless numbers in the crust of the earth?… Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such finely graduated organic chain; and this, perhaps, is the most obvious and gravest objection which can be urged against my theory."—Charles Darwin, The Origin of Species, p. 179