I'm still not sure it could do it. Tsar bomba at 1/2 power had a cloud something like 170,000 feet high, many times the height of Mt. Everest. And it's still tiny compared to continental plate that is billions of tons of rock and dirt spread out over hundreds to thousand of miles in area, and several miles deep.That kinda depends on how big the nuke is.
There's a reason the UDSSR tested the Tsar Bomba at half power. If you take a nuke like that, and soup it up with magic...
In fact, full-power Tsar-Bomba was intended to be one of the safer Nuclear bombs. The power would be ridiculous...but a lot of the fall-out would exit atmo, and thus not fall back down to poison the shit out of everything for miles around.
For all the talk about Nukes blasting planets...people seem to have trouble grasping the true size of said planets, or how non-directed blasts will only really scorch the surface. If you wanna crack geological-scale formations...a KKW from orbit is a much better bet. Even then it's still be difficult. Extinction-level meteorite impacts couldn't do it, this'd have to be a full magnitude greater.
All in all, sounds like more trouble than it's worth.
Nearly all our targets just don't require that kinda firepower...and the resources needed to pull it off would be prohibitive.
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