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It's frustrating to press R, have it not go, and not know why. When my spells are greyed out, I want to know why at a glance. Could the reason be color coded? Maybe only "grey" out the spell when it has no targets (Starcall, Soul Shackles), and "yellow" out the spell if I'm out of mana, and "red" out the spell if I'm silenced/stunned/etc.