Buildings don't usually make corpse, in object editor the say no decay. Mechanical units also dont decay Undead units are considered alive until killed. The trigger is OK. For custom units, don't make the ones you want decay
In the object editor, under which ever unit they morph into, which depends on the ability you are using delete everything in the following fields: Art - Required Animation Names, Art - Required Animation Names - Attachments, and Art - Required Attachment Link Names.
The problem is, what you want exactly is imposible to do in the game, and if possible, it would be just as Ghan said, this would cause you doing infinite damage. Try just not only increasing attack speed, but also increasing the attack and projectile so it could look kind of "fast" and "godly"...
I have to learn Java for a competition, but I need to find a good place to learn. I finished the tutorials at another place, but still need more knowledge. +REP for help.
i dont really remember, try pressing Print Screen when on the custom games menu thingy in the game, then just copy paste on your editor program, remember to crop though. I dont remember the command, sorry.