Primeval Sanctum

Flying, first strike, trample, indestructible
As long as Primeval Sanctum has less than 5 soul counters on it, Primeval Sanctum isn't a creature.
As long as Primeval Sanctum isn't a creature, at
the beginning of your upkeep, put a number of
soul counters on it equal to the number of
Shrines you control.