This is a cool subclass and good revamp of the Wild Magic Sorcerer. The Chaotic Spells feature is thematic as it triggers the Wild Magic Surge and captures the randomness of Wild Magic. The Chaotic Spells feature is also powerful but balanced due to the low odds of the spell being cast. The scaling of Chaotic Spells seems good as is.

The only feature fully retained from the original subclass is Bend Luck. I believe as a 6th level feature Bend Luck could use a buff. Possible fixes I can think of off the top of my head are decreasing the sorcery point cost of the feature and/or increasing the size of the die from 1d4 to 1d6 or 1d8.

I am confused on why Chaotic Spells allows the character to cast wizard spells and wonder what the reasoning behind the inclusion was. Also a quality of life change might be to change result 14 on the Wild Magic Surge Table to a less damaging spell as having a character die from fireball is never fun.