Seasron, The Sea's Monster

Defender, reach
When Seasron enters the battlefield, Seasron gets {x} number of +1/+1 counters
equal to the amount of creature cards in your exile.
When Seasron gets 5 +1/+1 counters it can attack as though it didn't have defender.
When a card from your exile or graveyard is moved, put a -1/-1 counter on Seasron.
Deathtouch does not effect this creature.
{9}{u}{u}: Target creature gains Indestructible.