Im calling it now
It reminds me of the benefits you gain with one of Magic's best merfolks, Tishana's Tidebinder, only that it can be done every turn and for different permanents
2023-06-16 In a Two-Headed Giant game, life gained by your teammate won't cause Phial of Galadriel's second ability to apply, even though it will cause your team's life total to increase.

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The latter would be quite abusive with flicker and bounce while this very much isn't
It may not be the most reliable of the two for ones, not even always the best value of two for ones, but it is often enough and when it is it does tend to end the game