Cave of the Slumbering Sea God

Whenever you cast a spell put awakening counters on Cave of the Slumbering Sea
God equal to that spells converted mana cost.
{b}{b}{b}{b}{b}{u}{u}{u}{u}{u} Activate only if
there are fifty or more awakening counters on
Cave of the Slumbering Sea God: Transform Cave of the Slumbering Sea God.