polymorphism-loss of attack ability

Does anyone know of any other ability than Hex and Polymorphism that would allow a unit to transform other units. Because I wanted to create a spell that changes friendly units into monsters which could attack, and with these spells the unit transformed will lose the ability to attack whatever you change it into.

I don't think its doable with abilities. Note that all the Transform abilites except for Hex/Poly require you to set the Base Unit. Unless your willing to make a transform ability for every potential target on your map, I'd just get started on a trigger version.