When using Misdreavus' "Dual Draw" attack, do the players have to draw all 3 cards, or can they just draw 1 or 2 (or none)?
You must draw all three if you are able to (or as many as you can if you have less than three). The attack does not say "up to 3 cards".
Source: Undaunted FAQ (2010-09-09), PUI Rules Team (2010-09-09)