Legacy icons.

I was looking through PBE and noticed the dawnbringer icon form the yasuo vs riven event. I know that it is a legacy icon that was only available to get during the event but I still want to get it for my main account. Would re-rolling icons in the loot section work to get legacy icons or is that icon permanently unavailable, and unable to be gotten by any means. thanks in advance to anyone that has an answer.
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