Cass e reduced to 20 without poison

I would like to know what people think if cassiopeia e "twin fang" would cost only 20 mana if the target is not poisoned. I find it shouldn't cost so much if this spell is not empowered by the bonus damage on poisoned targets. In the case of last hiting or after you missed your spells or the enemies jukes them, I find it a bit too punishing to cast a spell for 40/50/60/70/80 and only damages of 50->120 (depending on level) + 0.1 AP ratio. I wonder what people and RIot think about that
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