What are reflexive triggers, and what happens when a player removes their own unit in response to Falling Star or Icathian Rain?

Ruling: Reflexive triggers are triggered abilities where the triggering condition is the spell itself resolving. If a player removes their own units in response to Icathian Rain or Falling Star (via reaction spells like Gust or Recall), the caster must choose their own units as targets for the reflexive triggers.

Sequence:

• Icathian Rain or Falling Star is cast
• Opponent has opportunity to respond with reactions (like Gust or Recall) to remove their units
• When the spell resolves, reflexive triggers go on the chain
• Caster must declare valid targets for each trigger
• If opponent removed all their units, caster must target their own units

Nuances:

• Icathian Rain and Falling Star cannot be played during showdown (they are not action or reaction spells)
• These spells can target anywhere on the board, not just battlefields
• Targets follow units anywhere on the board
• The caster cannot choose not to target anything; they must declare valid targets