Varial Heelflip - Aka 180 Shuvit Heelflip. A frontside pop shuvit heelflip.
This trick has always been a challenge for me. I can frontside shuvit and heelflip pretty well. The timing of this trick just seems to be hard to figure out. Sometimes it pops perfectly sometimes not at all.
The trick to it is that you need to flick the flip later than the shuvit. You also need to kind of hop backwards a little to catch it nice. It is a tricky one. Once you lock down that timing then you got it good.