This is my usual team when going up against anything without Taunt or Riposte. Skadi loves to munch on the buffet of Beras, Freyas, and the occasional Tellurias. C.Rigard + C.Tibs + KH is just nasty. And Ariel keeps them alive and makes them fire that much faster.
Against a team with Sif, C. Kadilen, BK, Krampus et all, I usually run the following. Here, just outlast them. C.Sabina is awesome in shutting down buffers. Vela is great here in removing the attack buffs which BK and Krampus put up (after Onyx or C.Sabina disepll the taunt). Proteus is just all around awesome, especially against Double and Reverse Double, which is where Sif is almost invariably found.
I think 80% of my Raids use either of these two teams.