History
Tazza is the only inhabitant of a domain which exists in the twilight area on the edges of infinity. Dormammu once tricked him into thinking Dr. Strange was going to his realm seeking to destroy him. He fought Strange in different forms, each one with a different ability and resistance to a particular magic until he meets Strange in the actual one. The battle ended by Tazza getting distracted and then overwhelmed by Stephen’s magic.
Creation
Tazza was created by Roy Thomas and Steve Ditko but only used during Strange Tales #144.
Powers
Tazza showed the ability to take different forms and each with an individual capacity. He was even able to easily subjugate the defeated heroes controlled by Strange’s Astral Form.
According to Stephen, Tazza is more skilled than the same thought. Strange also said he doesn’t know who is the stronger between the two.