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5 raveners with Devourers and Rending claws. Make one the leader. Give one FnP, one Shred and one Ignores cover.

Seems pretty simple and straight forward? I've never played Tyranids before and I might consider picking up like a box of Raveners and a box of warriors ($100 for 6 models lol) just to convert up this little kill team. Hell, it might even evolve (see what I did there?) into a full blown Tyranid invasion (of my shelves)

EDIT: Or, change it up, taking a minimum possible kill team, for maximum stealthy ninja assassinness:
The Red Terror
Ravener with Deathspitter, FnP
Ravener with Devourer... Preferred enemy or Poison (4+) or ignores cover. Not sure which would be best for a Devourer.
Ravener with Rending Claws, Shred