Does Heimerdinger's ability copy Renata's legend ability, which has an Exhaust cost but no Exhaust symbol?

Ruling: No, Heimerdinger does not copy Renata's legend ability. An Exhaust ability must be an activated ability that has the Exhaust symbol as its cost.

Nuances:

• Having an Exhaust cost in text is not sufficient; the ability must have the actual Exhaust symbol to qualify as an Exhaust ability that Heimerdinger would copy.