Think about it. You have the dimension of Oriana that has ancient lost technology, hideous reptilian mutants and a fairy princess with magical tears. That sounds like a description of the Earth of Wizards. It could be taking place in some other part of this planet.
Both take place on Earth, long after a nuclear war which resulted in magic returning to the world. They also both have a huge range of bizarre creatures and a mishmash of magic and technology. Perhaps the Ice King is Avatar and Blackwolf's other brother.
- It probably takes place a few decades before Adventure Time.