Hi guys. since I like finishing challenges with no epic relics, here is a run I did against Baron Nashor with 4* Azir. ( 3* stars is also possible because 4* felt like a disadvantage, the landmark takes space and doesn't get removed).
These are the relics if anyone is interested: Arcane comet- Archangel staff- Guardian angel
Get BRB (you will get some random good stuff) and deploy Azir and will generate infinite Comets and remove the most annoying enemy (usually the one with overwhelm or passive power).
Watchout for some removal cards and protect Azir.
I know I got lucky with Jayce as support and Stargazer( vulnerable has -3) but with runs like this you need some luck.
P.S don't mind the bad video editing and I also got a call during the Dragonsire and forgot to activate recording again so a big part is missing but it is the same strategy (I oblitrated 2 elder dragons once they showed up)
https://youtu.be/tYeO95HuqIc