The Pyrenthian Carcass

The Pyrenthian Carcass enters the battlefield
with five slumber counters on it.
At the beginning of your upkeep, remove a
slumber counter from The Pyrenthian Carcass.
As long as Slumbering Monolith of Pyrenthia
has no slumber counters on it, it's a 10/10
creature.
"The colossal carcass, stirs in its slumber."