Vex - Apathetic vs Reflection tokens

Yes, an opponent's Vex, Apathetic at a battlefield will stun and restrict the movement of Reflection tokens created by spells like Mirror Image or abilities like LeBlanc's (Deceiver).

Reasoning

1. Trigger Condition: Vex, Apathetic has the ability: "When an opponent plays a unit while I'm at a battlefield, [Stun] it. They can't move it this turn."
2. Playing a Unit: In Riftbound, a token is considered "played" if the card effect that generates it explicitly uses the word "play" in its text.
   • Mirror Image (as an example) states: "Play a ready Reflection unit token to your base."
3. Interaction: Because these effects use the word "play," they satisfy the trigger condition for Vex, Apathetic. When the Reflection token enters the board, Vex's ability triggers, placing the stun effect on the chain.
4. Result: Upon resolution, the Reflection token will be Stunned and will gain the restriction that it cannot move for the remainder of the turn.

As established in RiftJudge FAQ #9240 and #9824, this ability triggers regardless of where on the board the unit is played, provided Vex is at a battlefield. Furthermore, as confirmed in RiftJudge FAQ #8746, the stun lasts until the beginning of the next Ending Step (which, in a 1v1 match, will be the active player's Ending Step, meaning it becomes unstunned the same turn), but the movement restriction remains in effect for the entire turn.

This interpretation is based on the provided FAQs; no rule contradicts this behavior.