I will start it off.
Buff: The Gorgotha buff was kinda neat , it already got a nice Legendary trait, but then got cleanse whenever you cast his spell as well.
Weapons: I have enjoyed both the Trickster’s Shot and the Divine Protector a lot. Both superb weapons and fun to use.
Troops: I had great fun with Leprechaun, one of my favorite troops ever released. The Maraji Queen I had a lot of fun with too, which let Elementals start out with 50 % mana, so a lot of options since there is many useful Elementals in this game. Then High King Irongut will be my 3rd choice, great fun to use, reliable whenever you get his attack to 100, and great in most events that allows him as well as PvP.