This is what I thought of
Makopocalypse
Diet: enemy nessie, submarines and Leos
Abilities: (boost) Blistering Speed, moves so fast that everything that it touches catches on fire.
(button) Roar of the sea, summons destructive waves above the ocean, large whirlpools and underwater hurricanes which will destroy prey.
(gold rush) Apocalypse rays, shoots out a beam made of fire and ice, freezing and burning parts of the ocean, anything that touches the affected areas will get instantly destroyed.
Cost: 500 gems and fully grown Mako