Duke Fishron, King of the Seas

At the beggining of your upkeep, If you
control two or more Islands, create a 2/2 blue sharkron token. If you control four or more Islands, draw a card. If you control six or
more Islands, put a Shadow counter on Duke Fishron, King of the Seas. If Duke Fishron,
King of the Seas already has a Shadow counter
on it, deal four damage to target player.