That working with lego on some project is exciting and always fresh and new, but sometime also that the lego was not suitable for machine with high specs and needs
The Balrog, Durins Bane is actually really good
I think a deck that combines a few of these approaches and maybe throws in a couple of good* planeswalkers like Calix, Destiny's Hand, Estrid the Masked and Kaya, Intangible Slayer can be a ton of fun
They exile two, you have until next turn to cast them, and you only spent two mana so you can easily use your mana for casting
On the other hand, legends in the main set can be designs built around the character independently of other cards to spark new archetypes of decks
Glimmers of a single character can make appearances in multiple sets with extremely different designs, each highlighting a distinct facet of the character