Our deck cannot survive the looting ban, as it gives our deck selection and velocity we need and there is no real alternative in mardu colors. This is an unlikely ban though, and I think looting is going to stay with us
That's an interesting board plan as he seem to not care about the slow clock at all. He also brings in wear//tear, 4th thoughtseize and I assume 3rd moon. I wonder what he takes out for these 8 cards? 1x Terminate, 2x Fatal Push, 1x Forked Bolt, 2x Lightning Helix are easy cuts, but what about other 2? Trim some number of bolts/lingering souls, maybe 1/1?
Nahiri is fine as we often have more than 4 lands in play. It was mentioned before that Selfeisek plays Helix since the beginning and never switched to CB. His 5-0 doesn't mean that Helix is better, than CB. It means that Selfeisek is a good magic player.
Creature based hate against scapeshift isn't optimal as they have 4 bolts and 4 sweltering suns/anger after sideboard against us. I'd try alpine moon - it's cheap (in both aspects), hates tron and valakut.