i.e., the person in the castle, past Alioth, at the end of time
2-1: (So, if you bet $1, you get $2) Some Loki variant we haven’t met. Maybe one who impersonated Odin at the end of Dark World and wasn’t found out until much later than the Sacred Timeline
5-1: Some version of a Loki variant we’ve seen. Evil Sylvie or Evil Kid Loki, for instance.
8-1: An evil version of Mobius or someone else at the TVA
12-1: Kang
25-1: Dormammu, Mordo or some evil version of Dr. Strange or Ancient One
40-1: Evil variant version of Thor, Odin or Frigga
55-1: Dr. Doom
100-1: The good Dr. Strange, frantically trying to backfill all the branches to make sure the timeline he claimed would work actually does work
150-1: Scarlet Witch, who conjured all this without realizing it while practicing in that cabin
500-1: Mephisto
10,000-1: Black Widow has somehow overthrown the Red Skull on Vormir and is using the Soul Stone to create this
100,000-1: Cap and Peggy used the Stones to create it before Cap returned all the stones. They are ensuring they are together for all time.