Can Wind Wall counter the reflexive trigger abilities from Falling Star after they are put on the chain?

Ruling: No, Wind Wall cannot counter the reflexive trigger abilities from Falling Star once they are on the chain. The reflexive triggers are abilities, not spells, so Wind Wall (which counters spells) cannot target them. Wind Wall would need to counter Falling Star itself before it resolves.

Sequence:

• Player A puts Falling Star on the chain
• Falling Star resolves
• Two instances of "Deal 3 to a unit" (reflexive triggers) are put on the chain as abilities
• Wind Wall cannot be played at this point because there are no spells on the chain to target

Nuances:

• If units die from the reflexive trigger damage, they are still considered killed by Falling Star (the spell) for kill attribution purposes
• The reflexive triggers are abilities for targeting purposes but attributed to the spell for kill credit