But for Song of Victory and Song of Defense you need to have Bladesong active, thus you can't use medium/heavy armor...Speaking of which, I do have a theoretical build in mind for the Bladesinger that involves completely ignoring Bladesong.
You're a Fighter or Paladin or Cleric 1 (probably Fighter) / Bladesinger X. You suit up in Heavy Armor and use a Maul or Greatsword while putting Dexterity in the backseat and focusing on Strength and Intelligence. You do lose out on Bladesong and 1-3 points of AC, depending on item drops. However, you still get Extra Attack, Song of Victory, and Song of Defense with all of the other standard wizard goodies, which goes great with using a two-handed weapon.
I'm not a huge fan of the idea, even in adventurer's league, because DEX is a much more useful stat than STR and I think that building the bladesinger towards melee damage isn't the smartest idea long-term. However, between Greater Invis and/or Haste and Song of Victory (let alone real cheats like Animate Objects or Simulacrum) your damage will be in sight of the Eldritch Knight for most of the game.
If you read the multiclass section on spellcasting in PHB 164/165 you will see that at lvl 11 George gains his first lvl 3 spell slots (spellcaster level 5 = 2[BS2] + 3[EK9/3]). The EK section on spells known on PHB 75 states that a) "spells you learn at 8th... level can come from any school of magic." b) "Whenever you gain a level in this class, you can replace one of your wizard spells you know with another spell... of a level for which you have spell slots, and it must be abjuration or evocation... unless you're replacing the spell you gained at 8th... level". So reaching lvl 11 George hits his 9th EK level, gains a third level spell slot, and swaps out his non abj/evo spell from EK8 with Haste.Hm... what I don't understand in the last part ist about the EK18/BS2 called George.
You write "He did this to get spells like Haste just a little bit sooner." and in the calculations George starts getting Hasted numbers at lvl 11 (EK9/BS2).
But how Multiclassing works he is delaying access to higher level spells. He still can take haste at EK 14 the earliest (because it is not a abjuration or evocation spell) and for George that means character lvl 16.
With this assumption in play, I won't comment specifically on the rest of your post. If I have the time, and can get my head back into the intricacies of my spreadsheet, I might someday experiment with giving George Duelling and a Rapier. But in my opinion, considering the ratings I allotted them in my summary:With Haste out of the window,
I think this ends up depending a lot on your DM's style, and the type of campaign you're playing. I found myself in situations where it was fairly easy to predict combat (when the party is doing the stalking/infiltration, heard voices through the door, DM does a seemingly pointless scene description ). In these situations your biggest challenge is predicting the threat level and spending an appropriate number of spell slots. In less favorable circumstances, it's still often possible to justify a surprise round, or scream "Mirror Image!" so quickly cutting off the DM's description of the enemy that your character becomes known for his trigger finger. Otherwise, yeah, you probably only want to cast a single buff spell before entering combat (or none if you think your AC is enough). Depending on your party comp, and how well you communicated that you're playing a striker and not a controller, you might also be lucky enough to receive buff(s) from someone else first round.Nadrigol, what does a typical combat look like for you? I ask because I'm interested in playing a Bladesinger, but it seems to me that you would spend the first two rounds casting buffs on yourself (Mirror Image and whatever concentration spell you feel like).