He's broken now in higher tier just as i previously predicted. The changes practically turns magebane into a strength kinesis now, in a bad way.
The shield effect at early level effectively made him into a very strong and tough opponent, especially in long lane setup. Coupled with another healer = he can outcompete opponent's carry.
Previously, magebane requires a brain to be aggressive, e.g. by considering the risk follow after blinking. Now the risk is gone, he can yolo jumping around with much more gains than losses.