There's a ton of stuff here that fans of the classic show will like, and a lot of stuff that fans of only the modern show will only recognize from specials that feature past doctors or returning stuff
Whether its turning your attacking creatures into an overwhelming force or breaking its brutal combo with Heartless Hidetsugu, this damage-doubling angel will likely finish the game shortly after being cast for a hefty 7 mana
Not only does Green give you access to all the Enchantress goodies like Enchantress's Presence to bolster your Aura theme, there are also some cards that bridge the gap between Auras and Tokens like Pollenbright Wings and Dreampod Druid as Aura-based ways to fill your battlefield with creatures
Hexplate Wallbreaker (reg/EA $5, no foils) If theres one thing Commander players love, its having a commander that does something, and then picking up all the cards that do the same thing
If this were all Solemnity did in Standard, its strength in sideboards would mostly depend on how good Temur Energy is in the format, but thankfully it does a lot more