Bidente de Tassa

Text:

Toda vez que uma criatura que você controla causa dano de combate a um jogador, você pode comprar um card.
, : As criaturas que seus oponentes controlam atacam neste turno se estiverem aptas.

Rulings:

• 3/16/2018 The controller of each attacking creature still chooses which player or planeswalker that creature attacks.
• 3/16/2018 If a creature can’t attack for any reason (such as being tapped or having come under that player’s control that turn), then it doesn’t attack. If there’s a cost associated with having a creature attack, the player isn’t forced to pay that cost, so it doesn’t have to attack in that case either.