I never really understood what was going on in
the original art for this card from Invasion,
with one of Urza's power armor suits. I'm not
sure I understand what's going on in this new
art, for that matter. For many people, though,
that will be secondary to the possibility of
destroying every creature an opponent controls
and making them discard their entire hand.
Unfortunately, the sorts of decks that are
likely to be vulnerable to that will also often
kill you before you can afford to cast Void, and
I worry that the rise of midrange decks in every
format leaves many opponents with built-in
insurance. But when you do get it off, it can be
absolutely devastating.
Actually, come to think of it, if your setting
allows Rare-B-Gone, it will do much the same
thing, maybe even more often!