Even in the relative safety of the city, there are places best left undisturbed.

Trespasser's Curse

Enchant player
Whenever a creature enchanted player controls enters, that player loses 1 life and you gain 1 life.

Amonkhet Remastered

Enchant player
Whenever a creature enters the battlefield under enchanted player's control, that player loses 1 life and you gain 1 life.

The List

Amonkhet

If a creature enters the battlefield under enchanted player’s control and causes an ability controlled by that player to trigger, the triggered ability of Trespasser’s Curse resolves first if it’s that player’s turn, and resolves last if it’s your turn.