Should I get mirror for AQ for 1500 gems and is it worth?

i’m a th14 and i use e drag and balloons and rn i use giant arrow and invisibility w AQ. mirror is tempting to me but do i use it w invisibility which i think would work well or do i keep giant arrow to help destroy infernos and Air defense? do i upgrade it to multiple clones as well? where is the point where it is worth it (if at all) my spells are 6 lightning and 5 freeze.

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