Spells that arguably break the game

[Micah]

BoT could certainly go, it's an incredibly powerful spell under the right circumstances, it's very difficult to counter effectively (especially since overwriting doesn't help outside of then being able to kill the caster which then leaves an empty global slot...), and it doesn't serve as a vital counter TO anything (like mind hunt vs stealth.) Sea of Ice could also be given the axe.

Both these spells are able to effectively shut down the games of certain nations without necessarily painting a target on the caster's head from unaffected nations, which is a bad play mechanic (though great strategy...divide and conquer.) Most of the "balance" of these spells comes from the circumstances they need to be effective being rare, but they're both kind of stupidly overpowered in the right situation. The fact that they can't be overwritten REALLY makes it worse as well, since Dispel is a loser's game.

Everything else on the list adds a good amount of tactical depth to the game.