New-Hatched Leviathan

{u/b}: New-Hatched Leviathan becomes a Egg
Mutant with base power and toughness 1/3.
{1}{u/b}{u/b}: If New-Hatched Leviathan is a Mutant,
it becomes a Mutant Octopus with base power
and toughness 4/4 and shroud.
{3}{u/b}{u/b}{u/b}: If New-Hatched Leviathan is an
Octopus, it becomes a Mutant Octopus Leviathan
with base power and toughness 10/10, trample,
and Islandwalk.