Yeah for Tyranids.
We had a similar Nids list take second at our local Ard Boyz event with twelve players. Simon's Witch Hunters finished 3rd, and that after not playing the third match. :PMy Fatechopper list beat up on a baby seal Grey Knights player (Hint: Skulls for the Skull Throne! is not a Daemonic Gift) and played a draw with my secondary wave to a solid Space Wolves list. Just in the middle ran into an obnoxious IG list and Fateweaver died after rolling just 12 saves. Just dead.
Twelve players, hmm, I meant 14 players. It's too late and I'm too tired. :D