If a unit uses Ride the Wind to join a combat showdown after Ahri's debuff has already been applied and multiple cards have been played, does the new unit still get -1?

Ruling: Yes, Ahri will trigger and apply her debuff to the new unit.

Nuances:

• Ahri triggers the first time a unit gains the attacker designation at a battlefield her player controls, regardless of when during combat they gain that designation
• The timing of when the unit joins combat (even mid-showdown after other cards have been played) does not prevent Ahri's trigger