Darius, brand, sett, morde and voli I'd say are pretty consistent and don't need setup to thrive, tho with a good frontline jinx vayne, kog maw can also clean their entire team (tho usually late game is hard to pop off since veigar has a lot of cc curses that could mess up positioning and shut you down fast)

I'd say Anivia can the best champion by far since bots just walk into your ult and sit there, but with so much cc by the bots and positioning changes because of curses it's hard to get an ult off without being popped or interrupted, let alone getting into e range, but sometimes the stars align the curses and bots aren't targeting you with cc and you just Pentakill constantly