Necrotic Feeder

Whenever a creature dealt damage by Necrotic
Feeder dies this turn, exile it and gain 3 life.
{b}: Exile a creature from your graveyard, gain 1
life.
{b}{b}{b}: Each opponent exiles a creature from
their graveyard. For each creature exiled this way,
gain 2 life. Activate only as a Sorcery and only
once per turn.