When a player gains or loses life in a Two-Headed Giant game, how does it affect the team?

In a Two-Headed Giant format, players are part of a team, and they share a combined life total. When one player gains or loses life, it directly impacts the overall life total for the team. This means that an individual gain or loss of life is reflected in the team's shared life total, which both players need to keep track of.

For instance, if one player of a team gains 3 life, the total life of the team increases by 3. Conversely, if one player loses life, the team’s total decreases accordingly. This mechanic emphasizes the collaborative nature of the Two-Headed Giant format, where both players must work together to manage their shared resources and strategies effectively.

Each life total change affects the entire team, which is pivotal in determining the outcome of the game. Thus, option B accurately captures this important detail of teamwork in Two-Headed Giant matches.