How to word a spell

I recently made a card called Unleash Potential that has the following effect:

"Copy target instant or sorcery spell which has a target for each possible target. Assign one copy to each possible target. You lose 1 life for each copy made this way."

Is there a better way to word that? Could I give the card overload while it is in the hand, make the overload cost the spell's cost + 1 life for each potential target?
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