What's the worse TFT team comp?

Nobles. Too hard to complete. The build encourages you to spend on re-rolls, but depends on getting a Kayle. Which is counterintuitive. Its a bad comp that requires too much luck to even pull off.

Noble unless you get a Kayle early so you can super stack her with items.

I say that because a lot of the meta teams (phantom, yordle, glacial) just lock them down forever or have decent/good spell dmg.

Nobles can be great but not reliable enough.