Using Wizard on another player when draw deck is empty?
According to the rules. A single card is to be removed from the deck at the start of each round. This removal serves two purposes. The first is to remove perfect information. So that in the final rounds you can deduce the likely card your opponents have but not necessarily with 100% certainty. The second is to be used in situations like you describe. If you need to draw a card for the final action that card is the card which was removed from the game. Then you compare numbers and establish a winner of the round.