If I control Reaver's Row with only a Traveling Merchant, and my opponent attacks, can I use Reaver's Row to move Merchant to Base (discarding Flame Chompers), then play Chompers to Reaver's Row while still in combat?

Ruling: Yes, you can play Flame Chompers to Reaver's Row. During combat, the battlefield remains Contested and control cannot change until combat ends, even if only one player has units there temporarily.

Sequence:

• Opponent attacks into Reaver's Row
• Use Reaver's Row ability to move Traveling Merchant to Base, discarding Flame Chompers
• Play Flame Chompers to Reaver's Row (battlefield is still Contested during combat)

Nuances:

• Control of the battlefield cannot change during combat, so even though only units of a single player remain temporarily, the battlefield stays Contested until combat resolves