Greta, Cyclic Scavenger

Eminence - If Greta, Cyclic Scavenger is in the
command zone or on the battlefield, At the beginning
of each player's upkeep they create a 1/1 Pest
creature token with "When this creature dies, gain
1 life." Whenever a creature is put into the graveyard
from anywhere, create a food token.
{b/g}{b/g}: Each player sacrifices a creature, then if they
do they create a food token
{b/g}{b/g}: Each player discards a card, then if they do
they create a food token