How do players in a Two-Headed Giant team take their turns?

In a Two-Headed Giant format, players on a team share their turn, which is why the correct choice is that they use shared team turns. This means that both players on a team will play at the same time during their turn, working collaboratively to make decisions and execute their strategies. They draw cards, play lands, cast spells, and do everything else that occurs during a turn collectively, while only one player is considered the active player for the purposes of game actions.

This shared turn dynamic encourages teamwork and communication, as both players combine their resources and abilities to affect the game state. It allows for a more strategic and integrated approach to gameplay, unlike in a standard game where players take individual turns.

The other options do not accurately describe how turns are handled in this format. Alternating turns would imply that teams take turns separately, and each player taking turns simultaneously contradicts the structure of turn-based play in Magic: The Gathering. Allowing one player to lead suggests a hierarchy that does not exist in the Team format, where both players are equally engaged during their shared turn.