Just cast with your mage ´blizzard´ and jump when you see the cast bar.
The animation is there until the server will restart . With this you can make a storm of blizzards and that will make the server lag and it´s pretty funny .
Here a little vid (yes i was bored ) :
GL & HF !
tested and works on 2.3.3 and 2.4.1 !Is not client sided lol! It´ll only disappear with a shutdown of the server (in a case of stupid admins) or relog..but who knows that?
sry for my bad english ^^
E: works with Firerain (?) too (german : Feuerregen xD )