Sounds close so far, except it's missing an element of continuity. If, for example, your conditions state that landing on heads is more advantageous, then with each flip that is heads, the next flip should be even more likely to be heads. Say that after each heads flip, you add 50mg weight to the heads side.
I believe no such thing. I say that selection is a crooked gambler that keeps its winnings and is never required to pay its debts. I say nothing about who or what entity might have rigged the game, but evolution describes the game.