This ability counts the total amount of life gained without considering any life you lost during that turn. For example, if you lost 3 life and gained 3 life earlier in the turn, you will gain 2 more life from Essence Pulse and each creature will get -5/-5.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.