Darkbishop Benedictus is my favourite card of the expansion. Also I really like shadow theme in priest in general so I decided to build a shadow priest deck.

Stormwind gave this kind of priest decks some very good cards:

• Voidtouched Attendant that can be anything we want starting with tempo and ending with damage boost
• Twilight Deceptor is card draw that can be activated pretty easily in our deck
• And most importantly Darkbishop Benedictus that made this deck to happen

In starting hand we want to keep Undertaker with cheap deathrattle minions like Leper Gnome or Dead Ringer. We can also keep Kazakus, Golem Shaper against slower decks and Tour Guide against aggressive decks to remove early threats.

Some other cards explanation:

• Thrive in the Shadows to cycle through the deck and tutor shadow spells
• Shadow Visions to create more copies of various shadow spells in our deck. Mind Blast for additional burst or Twilight's Call and Raise Dead for more value
• Bad Luck Albatross to turn off opponent's reno effects
• Kazakus, Golem Shaper and his golems are very flexible and mainly here for board-wide buffs, card draw and rush/copy options. Can also be freeze or lifesteal if needed

This deck can win by either summoning deathrattle minions that deal damage straight to the opponent's face with cards like Twilight's Call and Raise Dead or by bursting down opponent from hand with Mind Blast or Shadowbomber