I was fixing up my mastery pages, and I stumbled upon the Feast mastery. At first, I ignored this mastery, as I felt that it was essentially useless.
Whereas Double Edged Sword, seems infinitely more useful and can have a large impact on the game, despite the increased damage taken.
In summary, is 20 health every 25 seconds actually useful on specific champions, or does dealing extra damage, but taking additional damage pose more of an impact on the the game?