Sankantsu demonstrated that Taskmaster's Up Arrows can OTG now in UMvC3. It seems to miss small characters like Amaterasu and Rocket Raccoon, but can hit medium-sized fighters as well as the big guys.
For what it's worth, I compiled a list of THCs that are easy to combine with Frank West http://www.youtube.com/watch?v=Zv4i-p...
I'm watching with no sound, so maybe there's something I'm missing, but the Ghost Rider stuff doesn't look amazing at all.
The thing about high/low unblockables is that there needs to be some pressure. If you see someone call a low hitting assist from full screen and know what he's thinking, all you have to do is jump block. You probably even get to punish the assist afterwards.
HIGH LOW UNBLOCKABLES ARE A GIVEN BY NOW