I believe the most powerful thing about combining with Scapeshift is that you get to use one Wish early for control - grabbing Therapy or removal essentially. Then your 2nd drawn Wish is ready to grab Scapeshift and win on the spot (win-con being 4 cmc means that you can more easily do this in a single turn). If you aren't going for Scapeshift in Jund then I would suggest having at least 1 wish target that either wins or massively tilts the game, probably at 5-6 mana. Not sure what that is...
Worm Harvest? Gets through countermagic and discard, makes use of fetches and you get to continue to power it out. Perhaps there's some Loam variant with Grove/PFire and this.