Can you play Commander Ledros to a battlefield you control if killing the only unit there is part of the additional cost?

Ruling: Yes, you can play Commander Ledros to a battlefield you control even if you kill the only unit there as an additional cost. You will retain control of that battlefield throughout the process.

Sequence:

• When you play Commander Ledros, it goes on the chain, putting the turn into a Closed State
• You pay the additional cost by killing your unit at that battlefield
• While the chain exists, cleanup cannot occur and control is not checked
• Commander Ledros resolves and enters the battlefield
• When the turn returns to an Open State and cleanup occurs, Ledros is already present, so you maintain control

Nuances:

• Control of a battlefield is only lost during cleanup in an Open State when you have no units present
• While a chain exists, the turn is in a Closed State and cleanup cannot occur
• You never enter a window where you have zero units at the battlefield during an Open State