At its most basic, Pure2 is a completely hands-off ‘Card at Predicted Number’ effect. That is to say, the spectator names any card, you show a prediction of a number that has been in full view throughout, they remove the cards from the case, deal to the number, and the card they named is there. You’ve touched nothing.
But it’s so much more than that. The method employed allows you to do a fully-fledged, completely hands-off ACAAN, that will be successful the vast majority of the time (the predicted number fixes the misses):