The spectator loads scan a QR code using their phone. A song player with one queued song loads on their phone They then randomly select any card (Free choice). When the song is played on their phone, it's all about one card. Incredibly the song's card matches the selected card.

No forcing. Any card can be named, even the Joker. You don't touch their phone. No NFC. No memory work. Works on IOS and Android.