The underworld leviathan

Indestructible, Unblockable, Shroud,Double strike, Flash
All effects that effect Crabs whales and fishes sharks and octopuses affect all your leviathans
All Blue creature you control have shroud.
all sharks have indestructible, whales have lifelink, Crabs double strike, octopuses toxic 3 and fishes are Unblockable.
At the beginning of your upkeep all your blue creatures
gain another creature type of your choice different than leviathan.
Red creatures have haste