First 5e Build: Bowman the Bard

[awaken_D_M_golem]

Uh-huh, and now that fantasy the junior crowd loves can exist:  a Pirate riding a Dinosaur.


Your combo illustrates the hidden value of Lore Bard especially.
The obvious choice at level 18 is Wish, but those lower level
{ spell + spell } interactions spool out rather quickly.
3 lists interacting at level 6, 5 lists interacting at level 10.
It's like they created this class specifically for the leftover
3.5e C.O. -heads to go on a decade long dumpster dive.
Throw Magic Initiate into the mix for another short list.
(Tome'Lock has cantrip trickery to itself)

[Power]

Actually you can polymorph both yourself and your paladin steed with the same spell. It's that perk of Find Steed - when mounted you can make any spell that affects you also affect your paladin mount. As for cantrip trickery, Magic Initiate and Spell Sniper can give you cantrips from 2 classes in addition to your own if you feel like it, although that's probably a waste of feats.

Also, yeah, helping yourself to all the cross-class spell combos in the game is one of the hidden strengths of playing a Bard in 5E. That and extremely high initiative and dispels (at least if you're playing a Lore Bard).

[awaken_D_M_golem]

Wow that's gonna come together something tight !

Get the Mounted feat at level 8.  Dive for the better 2 poly forms.
Warding Bond spell on you and the Steed, without the targetting yourself twice cheese = less problems with DMs.
Now it just needs a Concentration spell that would buff both, picked in the other level 6 slot.