When casting Icathian Rain against a unit with Deflect, do you pay the Deflect cost once or for each time you target that unit?

Ruling: You must pay the Deflect cost for each time you target a unit with Deflect, even if you target the same unit multiple times. Since Icathian Rain targets 6 times, you may need to pay Deflect up to 6 times.

Sequence:

• Choose all 6 targets for Icathian Rain (you can target the same unit multiple times)
• Pay the Deflect cost for each target that has Deflect
• Opponent has opportunity to respond with reactions
• Spell resolves and all 6 instances of damage happen

Nuances:

• You pay Deflect costs before the spell can be countered by effects like Windwall
• Opponents can play reactions after you choose targets but before the spell resolves
• All 6 damage instances happen at resolution; you cannot use reactions between individual shots