Quick Trigger Question

In the map im making I have an ability called "Equip Weapons" what I want this to do is replace the casting unit with a different unit when the spell is casted on a certain item (ex claws of attack +6)

I cant find the right trigger to do this please help

I think I understand what you're trying to do.

Event - a unit begins casting an ability

Condition - Ability = to ("___")

Action-

If (item type of (item being manipulated)) = to claws of attack+6, then (Remove (casting unit)) and (create one (********unit type of unit that you're using to replace the caster *************) at position of (casting unit), else do nothing.

You have to do an individual if/then/else trigger for each item type, though.