Invis rune?

I think an invis rune could be interesting, even with invis champs. And have a strong rune you could pick instead of it. Non invis champs can have a bit of an even playing field vs invis ones. Yes - you can stack invis potion with pyke, twitch, kaisa, akali, rengar etc which might be overpowered (sion using it as he ults or something). Make it last 1.75 seconds with a rather long cd? I'm not an adc/support main so I don't really have that bias of getting one shot by rengar (but yes it annoys me as a top laner). And have the rune not work while you're taking damage (ignite, dot), make it have an activation time like twitch q, but faster than twitch and usable in fights. Or is it too overpowered when used with an invis champ? (Twitch using it to get an attack speed boost early game) I think it could be a fun experiment, even if players want to kill someone for putting it in the game.