Can someone use Gust on Reflection token LeBlanc Legend?

Yes, you can use Gust on a Reflection token created by Deceiver (LeBlanc), but the timing and effect depend on when you play it.

Can you Gust a Reflection token?

Yes, Gust is a [Reaction] spell that returns a unit at a battlefield to its owner’s hand. Since a Reflection token is a unit, it is a valid target for Gust once it has entered the battlefield.

Timing and Interaction Scenarios

1. Gusting the Token AFTER it enters play

If you play Gust after the Deceiver ability has finished resolving and the Reflection token is already on the battlefield, the token is a valid target. Gust will resolve and return that Reflection token to its owner's hand.

2. Reacting to the Deceiver ability

If you play Gust in response to the Deceiver ability being placed on the chain, you are targeting the unit the Reflection is intended to copy, as the token does not exist yet.

According to RiftJudge FAQ #10346 and #10359:

1. Chain Item 1: The Deceiver triggered ability.
2. Chain Item 2: Gust (played in reaction).
3. Gust Resolves First: If you use Gust to return the intended copy target to its owner's hand, that target is removed from the battlefield.
4. Deceiver Ability Resumes: The ability continues to execute its instructions in order ("do all you can").
   • It successfully plays the 0 [M] Reflection token.
   • It then attempts to make that token a copy of a target unit at that battlefield.
   • Because the original target was removed by Gust, the copy effect fails to find a target.
   • Result: The Reflection token successfully enters the battlefield as a base 0 [M] unit, but it remains a 0 [M] token because it could not complete the copy instruction.

Summary

• If the token is already in play: You can target the Reflection token with Gust to return it to the hand.
• If you react to the creation ability: You cannot "fizzle" the creation of the token by Gusting its target; the token will still enter play, but it will fail to copy anything and remain a 0 [M] base unit.

Note: I could not fully verify the Might restriction mention against the retrieved rules.