Love that idea - but rather than ALWAYS use it on a roll of 10-16 (or whatever range you provide), have the DM announce the option. Otherwise, you're gonna burn through those BI die.
Cutting Words is highly useful in pretty much any level. The problem isn't the ability, your issue is your DM/a DM who won't roll in the open. If that is the case, you should ask your DM to either roll in the open or let you know if an attack roll has hit and your BI die will effect the outcome...
If you aren't really a buffer, then definitely skip faerie fire. It's a good spell, but if it doesn't fit with your RP, then not a good choice :)
As for invisibility I agree. You just nee done, it's a matter of the very powerful greater for a high level slot or the regular for more discrete...
Love your bard concept. It's very similar to mine, minus the spy/killer bit.
I'm currently at level 5 and have forgone weapons after my DM rolled a crazy horde treasure and I got one of the Instruments of the Bard (CLI Lyre). Since it requires it to be played to cast spells, I hold and play it...
This thread has been amazing. I've built my Lore Bard up to level 5 and about to hit 6 soon. It's taken me a little time to figure out how to play him, especially in combat, but at level 5 he is a battlefield management master. Between his control spells like Fear, Heat Metal, Hypnotic Pattern...