Which champions will you try to learn with the new sandbox in S7?

As most of you already know Riot will be releasing a sandbox mode in season 7 where you have no cooldowns on all your skills and spells. With that being said which champion will you try to learn using this mode? I'm sure there is a champion you absolutely love but never played before in ranked cause you know you will feed with it. For me it's Riven after practicing for 2 hours I still couldn't do the fast q combo once, maybe with the sandbox I'll get 2 hours worth of training in under half an hour, especially when your practicing combos related to your ulti.
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