The "kill x of your opponent's creatures" quest does not count creatures that have been killed but were sent to exile from a replacement effect like Leyline of the Void or Etching of Kumano.
I have killed several creatures in monored with Etching of Kumano on the battlefield, yet my quest progress stays at 0/25
The "kill x of your opponent's creatures" quest does not count creatures that have been killed but were sent to exile from a replacement effect like Leyline of the Void or Etching of Kumano.
I have killed several creatures in monored with Etching of Kumano on the battlefield, yet my quest progress stays at 0/25