Does Heimerdinger gain all abilities that have exhaust in their cost, and can he use each one separately by paying its cost?

Ruling: Heimerdinger gains every ability that has exhaust in its cost from other game objects. He can use whichever abilities he wants by paying their individual costs (including exhaust).

Sequence:

• Heimerdinger gains each ability separately (e.g., if there are cards with ":exhaust: : do A", ":exhaust: : do B", and ":exhaust: : do C", he gains all three as distinct abilities)
• To use any ability, he must pay its full cost including exhaust
• He chooses which ability to activate each time

Nuances:

• He does not activate all effects simultaneously with one exhaustion
• Each ability includes both its cost and effect
• Examples of cards this applies to include Vik legend, seal, and Malz