Icy Veins + Frostbolt + Exploit = Win

[Devolsh]

its the same as combustion for firemages really, you can enable combustion AFTER you have cast your fireball, when the fireball hits the target you will see that your combustion is affected by the fireball.

^ True.
The frostbite proc will be calculated "on the fly".

[Shadowalkerdk]

Actually when I cast Curse of Tongues on a paladin casting Holy Light I can see a difference in cast time so I think this works, I don't have a mage to test this though

Incorrect. The cast time is calculated at the beginning of casting, and never changes.

To those who say it is useless, you will gain the +freeze chance even if you don't get the cast time bonus.

[Devolsh]

Incorrect. The cast time is calculated at the beginning of casting, and never changes.

To those who say it is useless, you will gain the +freeze chance even if you don't get the cast time bonus.

Correctamundo !