Leviathan Remains

Leviathan Remains enters the battlefield tapped.
{t}: Add {c}{c}{c}{c}{c}{c}; spend this mana
only to cast creatures with power or toughness 5 or greater.
{5}: Sacrafice Leviathan Remains: Create a blue/black 5/5 Leviathan Soul creature
token with flying and hexproof.