Give Irelia a 0.5 second CD on her Q when she kills a unit

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This would be a huge nerf and it would hurt Irelia's kit. A better nerf to Irelia is her Q's damage as the CD reset on her Q is what makes Irelia, Irelia.

But riot refuses to nerf her Q damage....

Or maybe ramping cost of Q in a short time on different targets that are not marked? So if Irelia killed one minion the mana cost to Q to another minion would increase, kinda like kass ult. This way Irelia still can do her shit to marked champs with Q, but if she wants to quickly use Q to clear waves she has to carefully do it other wise her Q might make her run out of mana.

Sorry for the bad grammar... Hope my idea got across cleanly