Sheiress, the Lotus Muse

When Sheiress, the Lotus Muse enters the battlefield or at the beginning of your upkeep,
choose left or right. Players must attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that player. If not,
they break the law.
At the beginning of each other player's turn,
predict whether or not that player will break the
law. At the end of turn, if your prediction was correct, put target card from any graveyard or the battlefield on top of its owner's library.