Spells as item!?

[Spiffy]

Hi all... I'm making a map at the momement.
Now I want to add a shop into my map where you can buy spells in form of items...
Can any1 say me how I can do for example "Avatar" as item?

 

[FireFreak]

make items that are auto-used and triggers like
units use item ... add ability xyz to trigg. unit

 

[TTFTCUTS]

Do you mean permanently adding the spell to the buying unit, or buying items that when used cast the spell?