When conquering a Battlefield with Kai'Sa (4-cost), which ability triggers first - Kai'Sa's conquer ability or the Battlefield's conquer ability?

Ruling: When multiple "when you conquer" triggers happen simultaneously, you choose the order in which they resolve.

Sequence:

• Both Kai'Sa's conquer trigger and the Battlefield's conquer trigger occur at the same time
• You (the conquering player) order the simultaneous conquer triggers as you choose