Its effect is much more important than getting a few extra mills out of someone, and there are so many other ways to gain life, you won't ever need to bother
But on the flipside, its probably better to blitz anyway if you build a deck that has a lot of sacrifice synergies, like with Mayhem Devil or Mazirek, Kraul Death Priest
Have your weaker creature ETB as that thing, or even manifest a land from your hand with Scroll of Fate as a Restoration Angel reanimating your Agent of Treachery to steal your opponents highest value creature (happened in the first Mystic Reflection playtest game)
Endurance is similar but casts a wider, less targeted net
Stay safe, and follow the Clues
Well be sure to keep this article updated throughout the year, bringing you the best Pokemon packs to pick up and add to your collection