Actually Tanaraq lives, Tanaraq beat Doctor Doom, Namora, Mimic, Kulan Gath, Morbius and Zarathos all in the same day and he wasn't even trying. Really the team isn't anything special. Tanaraq can't even be killed
Only one who is prep cabable of is Iron Man, but three days to take on a skyfather? Magik needs to be in her dimension to be effective, but the sorsessor/mages listed are nothing compared to Talisman and he merely looked at her causing a magical backlash attacking her soul and mind.
Is it not possible that GR could use the Stare on him and Hulk can see Mystical Beings before they appear to others. Vision I would think is pretty smart to. Doctor Druid,Amanda Sefton and Jennifer Kale could not call on help to take on Tanaraq Hulk has faced Galaxy Master who is pretty powerful and Sefton and Magik stoped Archenemy and he Beat Mephisto and Dormamuu in there own realm.
I'm skeptical as he easily destroyed Zarathos without breaking a sweat. Hulk seeing the mystical beings won't help him much. Vision's smart, but prep worthy? I don't recall ever seeing him use prep. Tanaraq easily beat Kulan Gath who is even above these mystics, he is Dr.Strange level and no matter what he threw at Tanaraq nothing happened. Magik didn't do it alone and in the end beat Archenemy by destroying a machine, which won't help here.
Banishment is their best option, send him back to the Realm of the Beasts. If they do that, I definetly give them more wins than not.