Form of the Leviathan

At the beginning of your upkeep, Form of the
Leviathan deals 8 damage to target creature
or player.
At the end of each turn, your life total becomes 8.
Creatures you control have islandwalk.
All lands are Islands in addition to their other
types.
Creatures can't attack unless they have
flying or islandwalk.
Become the Stormtide.