For arcane powers - which includes any ranged attack worth a damn - you draw from the arcane deck. Or, rather, the defending player draws six cards, then you draw up to your Arcane stat. A lot of powers need certain colors to activate, and the number describes the magnitude. So you choose the card, lay it face down and say what color and number it's supposed to be. The opposing player can then call your bluff - after all, if you said that it's a blue three and he already has the only blue three in his hand, the situation is cut and dry. If they caught you in a lie, they can use a card from their hand - the desirable outcome is a Catastrophe card, which makes the power backfire. But if you weren't lying, the power works AND you can use it again with another card in your hand! This continues until you're either caught lying or the other player believes what you say.
