My point is that it's highly improbable that your experiment would work. That's not proof that evolution did not occur, however. It's also highly improbable that I will win the Powerball drawing if I buy a ticket. It's not proof that I won't win, however.
To use the same analogy, in evolutionary terms every creature alive has won the Powerball drawing, not only once millions of times. Each little incremental change was beneficial. The odds of one mutation being beneficial are astronomical, yet it supposedly happened millions of times in the same line for billions of creatures.