Azorius is one where the legends dont usually speak to me mostly because they tend towards controlling strategies and thats not something I personally enjoy much whether its Commander or tournament Magic
Since their debut, Planeswalkers have become a staple of MTG
Maddening Cacophony doesnt really fit the theme of the rest of the Secret Lair, but its on brand for the reaction this drop might cause
Instead, include a few powerful ones that work well with incidental graveyard growth and enjoy the extra value, as, in general, chasing threshold wont be worth the effort
Also, since the overall power level of Modern is dramatically lower compared to Legacy and Vintage, the 2 for 1 for countering a medium-power non creature spell is often not worth it
Legendary creatures you control gain protection from each of that creatures colors until end of turn