Ok so I thought of a few ideas for level 88 pets, tell me what you think (Not all schools are here as i think they would be based off a new spell)
Storm Leviathan (Gives one Leviathan card) Hybrids would consist of different colored leviathans
Fire Watermole (Gives one Rain of Fire card) Hybrids would consist of different colored pets or possibly watermoles with different type of gear acting as "tribe ranks"
Myth Medusa (Gives one Medusa card) Hybrids would consist of the 3 gorgon sisters (Medusa [Hatched with any spirit pet] Stheno [Hatched with the balance pet] and Euryale hatched with any elemental pet])
Death Frankenkatz (Gives one Dr. Von's Monster card) Hybrids would consist of different colors or different animal types like a frankendog, frankenlion, etc
Of course each of them can be based off new spells Kingsisle release, but these are my personal ideas