I think several locations are very powerful currently, but my personal favorite is Ravenscrest: Valley of Secrets.

Hero: Ter Adun (40 cards)

Ally (10):
4x Spitfire Hound
4x Ravager Zealot
2x Agnar, Flameborn Insurgent

Ability (16):
4x Grave Resistance
2x Battle Hardened
2x Valiant Defender
2x Urgent Business
4x Bad Santa
2x Bloodlust

Item (9):
4x Chaos Engine
4x Thriss Crucible
1x Distortion Harness

Location (4):
4x Ravenscrest: Valley of Secrets

Deck Code: 1314106B

I am taking a twist from the good old Support Ter, with addition of Urgent Business to the support lineup. Agnar has taken the place of Thriss Assault Plinth as it is more explosive. You can also use Battle Hardened to soak the damages from Agnar to prevent killing your own allies.

The pace of the deck is very fast, thanks to the draw and resource renewal by the location. Ter is also a natural counter some of the meta decks like Baduruu and Darkclaw, making it a favorable choice for monthly challenge.