What if there had been a "Rewind" Summoner Spell that reset the cooldowns on your basic abilities?

One of the level 20 talents you can get on some Heroes in HotS is called Rewind, and it resets the cooldowns on all your basic abilities. Great on Heroes like Anub'arak or Nova, letting them cycle their combos twice in quick succession. Now imagine if we had a similar Summoner Spell. >Resets the cooldown on your most recently-used basic ability. 240-300 second cooldown. On some Champions, I know it'd probably be completely broken (i.e. {{champion:63}} {{champion:12}} {{champion:107}} ), but it'd certainly be entertaining, wouldn't it? Who would you use it on? I'm sure Riot won't add this, but this is just for theorycrafting.
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