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what spell can do this ?
please reply with some candidates
sorry new link

Poison and Fire Damage AoE at range damage spells have this "explosion" animation: the blast extending from the point the projectile hit. For exactly the thing you should animate it yourself for the custom effect.

I mean destructive effect (nuking whole land) what spell it would be (what effect, magnitude, ect) ?

The best spell to do that would probably have to A. Be WAAAYYYY more magicka than anyone can legitly get, and B. be custom made and super expensive in terms of Septims.

And, it would probably need some custom CS work to make it that huge. The full-blown range of a spell can be pretty large when set to the largest area it can hit, but it still wouldn't go out more than a couple of dozen feet at most, if I remember right. Old game might not like it if you killed every actor on the map at once anyway.

Make a custom spell of whatever actual effect you want, it would just need to be Area of Effect, Destructive in some way to deal damage, but you won't actually explode the planet like the image you linked.