Bloodthirsty Aerialist

If Bloodthirsty Aerialist is dealt lethal damage at the same time that you gain life, it won't receive a counter from its ability in time to save it.

The ability of Bloodthirsty Aerialist triggers just once for each life-gaining event, whether it's 1 life from Impassioned Orator or 4 life from Dawning Angel. If you gain an amount of life "for each" of something or "equal to the number" of something, that life is gained as one event and the ability of Bloodthirsty Aerialist triggers 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.