When you rest Heimerdinger, do you cast all of your rest abilities or just one of your rest abilities?

Ruling: When you rest Heimerdinger, you cast just one of your rest abilities.

Nuances:

• An ability in this context is the full "cost: effect" structure
• Heimerdinger gets a copy of each ability that has an exhaust symbol in the cost part, including that cost
• When using an ability, you pay the full cost associated with that specific ability (exhaust plus any other costs) and perform that specific effect