I always thought of life/entropy as our failsafe through stuff together deck.
Six fallen elves, six novas, and whatever crap we've got left.
Life/entropy is also a good standby for fights life can't win. For instance, against Earth's otyugh deck with both gravity shields and titanium shields, there's no winning. The best bet would be fractal cockatrice, but even then, it'd be close. So, since it's a crap shoot, through together an entropy deck. Unfortunately, the deck would have to be 42 cards thick to protect the elves and the novas, or we'd be forced to lose one.
As I say, it's a panic button.