What is your worst/best re-roll ever?

I re-rolled Mecha zero Sion, because i didn't play him at all, and recieved Renegade Talon. Then i got DJ Sona (actually it was re-roll, but i got permament shard because i didn't have champ), but didn't re-roll that, because first one was huge mistake :D What is your worst/best re-roll?
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