Do Sett Kingpin and Lee Sin Centered need to be on the battlefield for their 'at my battlefield' effects to be active, and does the effect apply to one or both battlefields if controlled by the same player?

Ruling: Cards refer to themselves in first person, so "at my battlefield" means that specific unit's battlefield. The unit must be at a battlefield for the effect to be active, and it only impacts that one battlefield.

Sequence:

• The unit must be present at a battlefield
• The effect only applies to that specific battlefield where the unit is located
• If the same player controls multiple battlefields, each is treated separately