The Creek, Now a Divider

When this land enters the battlefield
choose a player either across from you or
to the side of you. You and chosen player
for the rest of the game are on a team. The
other two players are now the opposing team.
The Game becomes a Two Headed Giant game!!
In Two-Headed Giant, each two-player teams shares
a starting 30 life and takes their turn simultaneously
The team does not share any other resources other
than life. For instance, any reference to "you" on a
card still applies to the ind