Goddamn. I was not expecting this. Hard to imagine how they could improve on the original in ways that feel like they warrant a whole new game rather than just a content update for the original. That being said, I'm excited to see what they come up with.
On Android it works like a virtual mouse. Touch your cards so one is pulled up higher so you can read it, release your finger making sure not to activate the card, the card is still higher up, now touch up in the middle of the screen in a failed attempt to deselect the card. More often than not, that touch intending to do nothing spends the card because it assumed I drug it up onto the field.