In a Two-Headed Giant game, life gained by your teammate won't cause the first ability to trigger, even though it caused your team's life total to increase.
Voice of the Blessed
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, Voice of the Blessed's first 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.
The first ability of Voice of the Blessed triggers just once for each life-gaining event, no matter how much life was gained.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Anastasia Ovchinnikova
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