If I target my own unit with Icathian Rain's reflexive trigger, does Dreaming Tree trigger and let me draw a card?

Ruling: No, Dreaming Tree does not trigger. The spell itself did not target - only the reflexive trigger targeted, and target attribution does not trace back to the spell.

Nuances:

• Damage and kill attribution DO trace back from reflexive triggers to the spell (there are specific rules for this)
• Target attribution does NOT trace back from reflexive triggers to the spell (no such rule exists)
• This means effects like Raven Tome (caring about spell damage) will apply, but effects like Dreaming Tree (caring about spell targeting) will not
• The design intent (RAI) may be different, but the rules as written (RAW) are clear on this