One thing that's been bothering me on champions like Rammus and Lux is how their reactivateable spells (Rammus's W and Lux's E) don't have a different icon for when they can be reactivated.
For experienced players, this may not be an issue, but for players new to the champion, it can be difficult relying on visual particle cues in the middle of a massive team fight.
My proposal: have the icons change color (or something visually noticeable) to differentiate the first-cast icons from the second-cast icons.
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