I can't do that (. Maybe registering and make a list of ALL SPELLS IN THE SPECIFIC HERO like example Blood Mage: It has a spell Flame Strike, Banish, Phoenix and Drain Life, so that abilities will need to registered and the hero unit too then make a variable integer that Math Random - between 1 and 4. Make a spell targeted unit then make a trigger then make an ITE Condition that if the Unit Type is desired hero then Unit - Add Ability ( Math - Random between 1 and 4 ). This is instant spell and not like missile in the DotA ( Rubick SS ). Actually without missile I can do such that.