Stephen Strange is hanging up the cloak (Yes! Again!)... this time he's handing it to those who've had it in the past. I know there are a lot of priors but let's look at the most recent users:

Loki, Dr. Voodoo, Margali Szodus, Nina the Conjuror, Demon Rider (Kushala), and good old Sir Isaac Newton.

Using only their actions as Sorcerer Supreme, who had the most powerful showings?

Remove Loki if he was just overdoing it as a God already.