chamber2skipped
High Hand
It could be used for deck stacking easily enough by a competent card handler, and in ways that are near impossible to call somebody out on.
Imagine while shuffling you make sure every ace or king you run across is facing one way. It's impossible to call someone out on because roughly half of the cards should be facing that way with pretty big variance, but it would be enough to tilt the odds slightly.
Like I said, I'm excited for these cards for low stakes home games with friends, but it's negligent to use them in higher stakes games. There's a reason every deck of cards has a mirrored back, and pretending otherwise is ridiculous.