donate spells?

Ability to donate spells like troops..lightning being the more basic would take up 10to15 space in cc and as spells increase in level the space required increases to suit effectiveness...eg lev1 lightning 10 spaces but lev2 12 spaces in clan castle seperate toggle needed for spell drop and troop drop though

More than 5 spells would be too much and space doesn't increase for anything when level increases.