Does The Dreaming Tree trigger when you target a friendly unit at its field with one of Icathian Rain's reflexive triggers?

Ruling: No, The Dreaming Tree does not trigger from Icathian Rain's reflexive triggers. The spell itself (Icathian Rain) doesn't target, and the reflexive triggered abilities created by the spell don't count as "spells" for game purposes.

Nuances:

• Reflexive triggers killing a unit do count as the original spell killing that unit (per rule 415.5.d), but this appears to be a specific exception for kill actions rather than a general rule about targeting
• The abilities created from reflexive triggers are not themselves "spells" and don't inherit the spell's properties for triggering effects like The Dreaming Tree