Does Heimerdinger copy Renata's battlefield restriction, and can he use her ability from base?

Ruling: Heimerdinger copies Renata's exhaust ability but not her passive battlefield restriction, so he can use her ability from base. He must still pay the full cost (recycle 4 blue, tap 4, and tap himself).

Nuances:

• Renata has only one exhaust ability that Heimerdinger can copy
• The battlefield restriction is a separate passive effect, not part of the exhaust ability itself
• Heimerdinger inherits the activation cost but not location-based restrictions