The card must be cast if possible (that is, if it's a spell that for example targets something, if there is something legal that it can target, it must be cast targeting one of those things.) The casting is so mandatory, in fact, that if casting has some mandatory additional costs, they must be paid if possible
While more cards are bound to be confirmed over spoiler season, so far we've seen Castle Dracula (Voldaren Estate), Count Dracula (Sorin the Mirthless, which is getting another version with art by Castlevania's Ayami Kojima), Mina Harker (Thalia, Guardian of Thraben), Sisters of the Undead (Olivia, Crimson Bride), Dracula, Lord Of Blood (Voldaren Bloodcaster), and Abraham Van Helsing (Savior of Ollenbach)
Voxy was the first I ran into on Friday morning at the convention, hence the #1 here
Avatar: The Last Airbender showcases Aang's ability to transform into and out of the avatar state
Cloud, Midgar Mercenary is one of the best White equipment legends printed in years
