An interesting way to balance teleport

For balancing TP itself that sounds good, but that would also make it difficult to properly time skillshots anticipating the arrival. I'm pretty good at timing my Aqua Prison to hit them perfectly when they show up, but if the time is variable that's going to be hard to do consistently.

My personal suggestion would be to instead simply give it a range instead of being global. Like a level 3 TF Ult range (they could probably lower the CD in that case).

Alternatively how about having the cd based on travel distance?

Visual indicator with countdown timer like Fizz ult might work to help with that

make the duration of the channel depending on the travel distance