Legit.
I just tried it top vs a Garen to some interesting results:
I got over 40 stacks of Grasp in 12 minutes. Garen couldn't lane vs me.
(But ofc..... PBE..... jungler afk'd at level 5, bot was AWOL bot, and mid Zed lost to Ekko, so they surrendered with 4000g scores)
iiGazeii2 votesI think Senna's one of those champions who can make virtually any keystone work due to her Q both applying on-hit and resetting her long-range autos. She'll probably be able to get a ton of use out of the new Omnistone.
I don't think Grasp by itself is optimal due to her low HP pool and already decent sustain. Demolish isn't great due to her low HP, and in most games she can outrange towers anyway, and would be forced to step closer than her autoattack max range to get Demolish to start ticking. Revitalize is nice, but not necessary, and you can just get it from a secondary rune if you really want it.
Illabethe1 votes100 stacks over the course of a game creates a lot of HP..... and she can take 
and the new Spellthief for more HP. Keep in mind she has current % HP of target damage in her passive as well.
She doesn't outrange turrets until 100 Wisp stacks and a RFC (which isn't optimal every game). Most games are over by then. (You've been watching too much BunnyFuuFuu videos where he pleads with his PBE teams to stay and take the punishment so he can upload a massively loaded video where he got every WIsp possible)
The point of mentioning Demolish is because of high mastery use. Q doesn't require a long action delay and reloads an auto. In other words, high mastery players can actually do drive by demolishes without risking prones. They can be chasing a lane opponent they are bullying, and literally Q the turret on the way back out, to be able to soak 1-2 more turret shots through her Q heal, AND do a chunk of turret damage.
Grasp actually stacks faster on Senna than Dark Harvest does, ends up doing more damage, AND has much larger lane bully characteristics.
