Trespasser's Curse
From Amonkhet set
Trespasser's Curse
Enchantment — Aura Curse
Enchant player
Whenever a creature enchanted player controls enters, that player loses 1 life and you gain 1 life.
Rulings
- 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.