Philosophers Stone

When a creature is put into any graveyard put a soul counter on Philosophers Stone.
{t} Use 1 soul counter and gain 1 food token.
{t} Use 1 soul counter gain 1 treasure token.
{t} Use 1 counter and Mutate a homunculus.
Pay {x} soul counters retrieve creature from
graveyard. {x} is creatures CMC.