Kethen, the Drowing Tide

If Kethen, the Drowning Tide is the only
nonland permanent you control, put a +1/+1
counter on it at the beginning of each upkeep.

Spells your opponents cast cost {1} more for
each +1/+1 counter on Kethen, the Drowning
Tide

Whenever you cast a nonland permanent spell,
transform Kethen, the Drowning Tide.