A creature "fights" when an effect instructs it to fight
According to the banned announcement, "tribal decks relying on two-toughness 'lords' see very little play, and this (Punishing Fire) is a major barrier to their success." Unfortunately for Merfolk, a decade has gone by, and tribal decks relying on two-toughness lords still see very little play, even though Punishing Fire is banned
The differences between the theme decks can be found in the pull strips, cards being stored on the top or bottom of the box, the artwork on the back of the box, and of course the copyright dates on the box
Upon talking with our user experience designer and the designer for the foretell helper token, Daniel Holt had this to say: "We landed on the raven as a way to give a nod to Alrund, our Odin parallel, and included the Light of Starnheim shape (the diamond) in the center and along the edges of the bird's silhouette." You can find the finished raven design on each main set card in Kaldheim with the foretell mechanic and on the foretell helper token