So now you're a 5th level Sorcerer with:
AND Fireball and Dragons breath?
You cant have that many 3rd level spells, let alone that many spells.
As soon as you deal any damage to him, his incapacitation ends.
You should really read the rules man.
As I said, I didn't create a character to be the most powerful of all. Just to be fun, different and playable at any table.
And I will prove to you that this is a powerful Gish, which is the goal here.
3d8 + 4 with booming blade for extra 1d8 and 2d8 if the enemy movie.
Your HP is 43.
Color Spray upcasted is average 55 HP.
Quicken Color Spray, you are blinded.
Attack roll 6d20, Booming Blade for sweet 23 average damage + 9 if you move.
If crit, you are dead.
Next turn, repeat with level 1 color spray (33 avg HP).
You are dead.
This combo works very well against any class and very efficient against any monster.
If you are in non magical darkness, the Shadow Blade has free advantage a, then Double Booming Blade can deal more than 50 damage per turn with almost 100% chance of hit.