Can Heimerdinger Inventor copy Kai'Sa Legend's tap ability to add +1 power when casting spells, allowing both to be tapped for recycle cost reduction?

Ruling: Yes, Heimerdinger Inventor can copy Kai'Sa Legend's tap ability to add +1 power when casting spells, allowing you to tap both units for recycle cost reduction on the same spell.

Nuances:

• Playing Heimerdinger typically means sacrificing tempo early game to gain this ability later, which is why it's not commonly used despite being powerful
• If you have multiple tap abilities available (like Kai'Sa Legend and Ravenborn LeBlanc), Heimerdinger only activates one discrete ability of your choice, not all of them simultaneously
• Heimerdinger is vulnerable to removal spells like Falling Star or Icathian Rain, limiting his effectiveness against certain deck colors