Authority of Jarls and Empires

Creatures your opponents control enter the battlefield tapped.

Whenever a creature enters the battlefield
under your opponent's control, you gain 1 Life.

The flag of the City of Solitude hung above the entrance to Castle Dour, but so did the banner of the Empire. It was a constant reminder who garrisoned the castle and who dwelt in the palace.
(Based on Authority of the Consuls)