Only creatures on the battlefield when Death Frenzy resolves will get -2/-2. However, if a creature enters the battlefield and then dies later that turn, you’ll gain 1 life for it.
20-09-2014
wotc
You gain 1 life for each creature that Death Frenzy causes to have a toughness of 0 or less. The delayed triggered ability is created before state-based actions cause any creatures with 0 or less toughness to die.
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.