This could be used on the offbeat. Go and pay for something. Bust out a piece of paper and then change it while in the process of paying. You will stump clerks all over the world.
I think the invisible deck is more of a safety routine if you mess up and actually "loose" their card.
4-5 phases can be impacting. It's all about being entertaining.
Why do you have to stop performing an effect???
Pretty sure there is a bot attached to the account. So everytime you bid someone outbids you till the prices goes up to what the person wants to sell it at.