Marauding Blight-Priest
Creature — Vampire Cleric
Whenever you gain life, each opponent loses 1 life.
"The vampires never had gods. We followed our bloodchiefs. Now they are gone. What is left? Destruction and death, my friends. That is enough."
イラスト：
Zendikar Rising#112コモン英語適正
裁定
If you gain an amount of life “for each” of something, that life is gained as one event and the ability will trigger only once.
In a Two-Headed Giant game, life gained by your teammate won’t cause the ability to trigger, even though it caused your team’s life total to increase.
In a Two-Headed Giant game, Marauding Blight-Priest’s ability causes the opposing team to lose 2 life.
An ability that triggers “whenever you gain life” triggers just once for each life-gaining event, no matter how much life you gain.
Each creature with lifelink dealing combat damage causes a separate life-gaining event. For example, if two creatures you control with lifelink deal combat damage at the same time, a “whenever you gain life” ability will trigger twice. However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once.