goes in and out of meta, not reliable enough imho, though you don't need to 1trick her to do well enough on her, 1tricking on her DOES pay off, just not in every meta
pays off in every meta, so... go watch those 14 hour long tutorials
alternatively
is still good, she requires less skill to win with than riven but more than fiora on her baseline, she also has a rather high ceiling
is literally the only champion that can keep me interested, he has elements of bruiser, mage and adc in his kit, a really high ceiling and a pretty laughably low floor. If you can learn your basic QE combo you can do... ok... on jayce, if you can learn his kit, his item choices including the off meta stuff that works (Such as his unique interactions with crit, his power with sheen+tanky items, or even his power with klepto,grasp,aftershock, conqueror), you'll wind up with a duelist who can fight those otp rivens/fioras but who arguably has a larger item pool to choose from... but that's like autistic levels of devotion required...
that's the thing, can you stick to a champ long enough to play riven? if so then play riven and fuck your mmr until you're where you need to be, if not, grab fiora who's a great pocket pick type champ.
Also if you just want to BM people then play
(cdr)
and pretend like he takes immense mastery as you E someone to death