O) Hostile Hostel

{t}: Add {c}.
{1}, {t}, Sacrifice a creature: Put a soul counter on Hostile Hostel. Then if there are three or more
soul counters on it, you may transform it.
{t}, Pay 1 life, Remove any number of soul
counters from Hostile Hostel: Add {b}, then add
an additional {b} for each soul counter removed 3/7>
this way.