Rito, before you release Pyke on live.......
.... he definitely needs some nerfs.
He has a very fun kit and everyone is going to buy him since he makes the support role (which we all have to play sometimes) fun. So you are still going to make a ton of money off of people buying him even if he was underpowered.
What you need to nerf is the execution level on his ult. He easily gets to over a third of some champions health bars. I have even seen it close to half, which of course is absurd for a support. The other part of his ult is probably the most broken thing you have done in League history (which is REALLY saying something) is the duration of his resets. 20 seconds is so far beyond stupid that there is no way to justify it at all. 5 seconds is a long time in a teamfight, so this needs to be dropped down to 10 seconds at the very maximum, with 5 seconds being much more reasonable.
If you made those two changes alone, he would still be able to do everything you would like him too, without being toxic and unfun to play against.