As your move, every one of your pawns with an empty square ahead advances one square. Blocked pawns hold their ground.
You draft Great Migration in Buff mode. Activated: you choose when to use it, and using it is your move for that turn.
As a movement card, it changes how one of your pieces is allowed to move.
“The herd does not ask the fence for permission.”
Needs one of your pawns in play.