Don`t have to be legit or "meta", last comp me and my friends did was katarina, ap yi, ap trist, huge burst and no cooldowns

Yorick, Zilean and Shaco.
That 3v3 is now a 6v3.

Twisted Fate, Pantheon, and any tanky champion (preferably with hard CC).

They break blind pick/normal.
You need some real communication/team synergy to counter them post 6.

ive had fun with 2 comps in tt, i ran amumu/leona/shen once, enemy team lost simply to being unable to take any of us down effectively, and me and my friends ran kayle/zilean/trynd a long time ago, made for hilarous super fed trynd

My team's been running Nunu/Jax/Heim. Stun and slow people for rockets, and pull 'em back into heim's guns.

my favorite is swain morde and shy
but another gross team is ammumu wu kong and malzahar

when the new tt came out, i got a large win streak with
vayne - ashe - caitlin
strange, but it worked extremely well...

Been playing as Heim, Keenen, Morg. We tear up every game in normals and watch ppl cry how we are all AP and stupid. Good times.