Can I use LeBlanc deceiver to create a reflection of a reflection at a battlefield?

Yes, you can create a Reflection unit token that is a copy of an existing Reflection unit token using the ability of LeBlanc, Deceiver.

According to RiftJudge FAQ #9938 and Rule 182.1.d, token units are valid units and follow all rules for their type. When a Reflection token enters play, it becomes a copy of a target unit already in play. If you target an existing Reflection token, the new Reflection token will copy the current characteristics of that token (including the card it is currently copying, as those are its current traits).