http://www.wc3campaigns.net/showthread.php?t=99270
There are rules, however, most notably:
Theme:
Aimed Spells ~
The theme of this contest is to make a spell that requires aiming to hit its mark! That means no target-unit abilities. Some examples of aimed spells from standard WC3 are Breath of Fire, Shockwave, Carrion Swarm, Flame Strike, Blizzard, and so forth. It can hit a single target, it can hit allies, it can hit enemies, it can hit anything! Notice that this leaves it open to the participant to decide just how the aiming takes place since the only requirement is that it be aimed somehow.
Keep in mind an idea consisting solely of adding shiny 'special' effects to some existing spell won't be of much use. Mere details of a spell concept, such as some interesting effect without further details of its implementation could be worthy instead.
