Poppy W + R

That's awesome.

{quoted}

Poppy's W only stops effects that her enemies apply to themselves or their allies (so it'll stop dashes, jumps Thresh W pull etc). It doesn't affect displacements applied to enemies however, so if you're playing Tristana with an allied Poppy her W won't interrupt your ult's knockback.

Wait. It stops Thresh lantern escapes? A way exists now, after all this time? Praise be to Poppy!

I fear everyone is gonnaplay poppy into a hypermobile champ ( Kali, yas, ahri) and the mains of those people will complain that poppy is op cuz they can't dash everywhere all the time.

On a side note, will the concept of her w active be used on other champions?

(Smacks table with fists) That's the last straw, I am definitely taking new Poppy bot as a support now.

Does it stop enemy Tahm's Devour on their allies?

(so it'll stop dashes, jumps Thresh W pull etc)

Oh god yes.

You cannot. The ults description specifically says that the victims are untargetable till they hit the ground again.