Texto em português

Quando Kardur, Flagelo da Colisão, entra no campo de batalha, até seu próximo turno, as criaturas que seus oponentes controlam atacam a cada combate se estiverem aptas e atacam outro jogador que não seja você se estiverem aptas.

Toda vez que uma criatura atacante morre, cada oponente perde 1 ponto de vida e você ganha 1 ponto de vida.

Rulings

Kardur's first ability affects all creatures your opponents control, including any that enter the battlefield after the ability resolves.2021-02-05
If a creature an opponent controls can't attack for some reason (such as being tapped or having come under its controller's control that turn), then it doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so the creature doesn't have to attack in that case either.2021-02-05
If a creature an opponent controls doesn't qualify for any of the above exceptions and can attack, it must attack a player other than you if able. If the creature can't attack any of those players, or if there are no such players, it must attack you or an opposing planeswalker.2021-02-05
If a creature affected by Kardur's ability could legally attack multiple players and/or planeswalkers, its controller chooses who it attacks.2021-02-05
Kardur's last ability will trigger no matter who controlled the attacking creature and no matter who it was attacking.2021-02-05