Can you conquer a battlefield you already held this turn (e.g., leave it and return to reactivate abilities like Targon Peak)?

Ruling: You cannot conquer a battlefield you have already scored this turn, even if your unit leaves and returns.

Nuances:

• This applies to effects like Kai'Sa or Targon Peak that trigger on conquering
• Leaving a battlefield and returning does not allow you to conquer it again in the same turn