TFT items and abilities

I have been playing a lot of TFT recently (honestly love the game so much more than league) and I have kind of been curious about maybe adding an item or changing an ability to make the game have more counter-play. Right now dashes are a huge part of the game (assasins, pyke, lucian, gnar, shyv, rengar, ect), but there is no way to ground champions. My most logical idea involves changing an existing champions ability: Poppy.

Poppy has been buffed twice in the last two patches and while her ult does huge damage and cc it just feels out of place and lacks uniqueness. I was thinking maybe you could change her ult ability to her w, similar to shens block in TFT in would create a large circle which halts/ or grounds and champions outside/within. This would be huge for shojin pyke counter-play, as well as fending off a lucian who keeps dashing away in fights.

Poppy ability: 75 mana 2/4/6 second duration If Dash is interrupted damage 100/200/400 Units inside the ability who attempt to dash will move one square instead (taking damage in the process). This allows shyv and gnar to still transform so the ability isn't too overpowered.

As far as item is concerned it would require something new to be introduced (like a boot?) and would be 'boot' + tear or something along those lines. It would give 25% chance to root. This way rooted champions can still cast and basic but would not be able to move towards or away from the attacker. would be really strong for corner rangers/slingers who are trying to keep champions from approaching.