The Cave of Poisons

Cave of Poisons enters the battlefield with X
poison counters on it. Where X is the number of creatures in graveyards.
remove X poison counters from Cave of Poisons:
all creatures get -1-X until your next turn. Until
your next turn whenever a creature dies
proliferate.
Whenever a creature dies, if their at least 10 creatures in each graveyard, copy Cave of poisons
once for each poison counter on it.
"it is meant to combo with escape"