Does Bonesinger Choir work on Saim-Hann Jetbike? I am reading it as:
Interrupt: When you deploy an Eldar vehicle, exhaust this support to reduce its cost by 2 (to a minimum of 1).
or
Interrupt: When you deploy an Eldar drone unit, exhaust this support to reduce its cost by 2(to a minimum of 1).
Bonesinger Choir
Type: Supprt
​Faction: Eldar
​Cost: 2
​Shields: 0
Signature/​Loyalty: None
Traits: Upgrade.
Limited.​
Interrupt: When you deploy an Eldar vehicle or Eldar drone unit, exhaust this support to reduce its cost by 2 (to a minimum of 1).
Saim-Hann Jetbike
Type: Attachment
Faction: Eldar
Cost: 2
Shields: 2
Signature/Loyalty: Loyal Icon
Traits: Wargear. Vehicle. Saim-Hann
Attach to an army unit you control. Limit 1 per unit.
Combat Action: Exhaust this attachment to move attached unit to a planet with a type shared with this planet. Then, deal 1 damage to an army unit at this planet.