It sounds like a huge sum of money, so you can forgive me to turn it off then, but stick to it, because you won't spend as much money as you think. This is because each credit that makes up a coin is only worth 0.01, so the first bet can be as low as 0.64. They come in three different colors to choose from, so finding any of them will give you x10, but if you match them perfectly, the bonus will increase from x30 to x70.
Like this, it is a dragonfly holding a pearl with a text pearl attached to it, which gives the maximum amount you want to get from any symbol. If you want to find any of the three icons, you will want it to be these.