Showing that your deck is mixed and ordinary, you also show a card with a prediction written on the back. The spectator chooses a card completely at random, by rolling 1,2 or 3 dice. You deal to their number (no forces).
When you reveal the prediction you have not only predicted their chosen card, but also what number they rolled on the dice.
You are supplied with everything needed, plus a Online video instructions with full explanations.