Can I Star Cross a unit that Leblanc is trying to copy with her legend ability? And what happens to the reflection token, and is there anything different if there are two units there at Leblanc's battlefield?

Yes, you can Star-Crossed a unit that LeBlanc is attempting to copy, and you can also Star-Crossed the Reflection token itself after it enters the battlefield. Because both Star-Crossed and the reflexive trigger from LeBlanc's legend ability use the chain, they can be interacted with.

Here is the breakdown of how these interactions work:

1. Can you Star-Crossed the target unit?

Yes. When you use LeBlanc’s legend ability (Deceiver), the copy effect happens as a reflexive trigger. This means:

• The token is created first, and then the ability "It becomes a copy of another unit there..." goes on the chain.
• You choose the target for the copy effect only when that reflexive trigger resolves.
• If your opponent uses Star-Crossed to return the unit you intended to copy to its owner's hand in response to that reflexive trigger, that unit is no longer "there" at the battlefield. When the reflexive trigger attempts to resolve, if there is no other valid target remaining, the copy effect will have nothing to copy.

2. What happens to the Reflection token?

The Star-Crossed spell returns a unit to its owner's hand. If you target the Reflection token with Star-Crossed, the token is returned to your hand (or technically leaves the board zone, as tokens cannot exist in hand; they cease to exist once they leave the board). The Star-Crossed effect succeeds in removing the token from the battlefield.

3. What if there are two units at the battlefield?

If there are two other units at the battlefield besides the Reflection token:

• Flexibility: When the reflexive trigger resolves, you still get to choose which of the remaining units the token becomes a copy of.
• Removal: If your opponent Star-Crosses one of those two units, you simply lose that unit as a potential copy target. If you still have the other unit present, the Reflection token will still successfully become a copy of that remaining unit.
• Full Removal: If your opponent plays Star-Crossed targeting the Reflection token itself, the token is removed from the board regardless of how many other units are present.

Summary of Timing

• Trigger Window: You trigger LeBlanc's ability (discard cost paid, LeBlanc exhausted).
• Creation: The Reflection token enters the board (this skips priority; it cannot be reacted to).
• Reflexive Trigger Window: The reflexive trigger ("It becomes a copy...") is placed on the chain. This is the Closed State window where your opponent can use Star-Crossed to remove your potential copy targets or the token itself.
• Resolution: The reflexive trigger resolves, making the token a copy of your chosen target.

This is my interpretation based on the mechanics of the chain, reflexive triggers, and the Star-Crossed spell. No official FAQ exists for this specific interaction.