Zilean W casting suggestion

I was wondering if it would be possible to make that Zilean can't cast his W if he has no abilities on cooldown. It happened to me many times to accidentaly cast W before my other abilities and to be basically deprived of one spell for no reason. Making it so that he can't cast it unless he has an ability on cooldown would be a nice QoL improvement for Zilean players don't you agree?
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