It is a return to some of the oldest and most classic stories in MTG history. In this video we recap the events following the Phyrexian invasion of Dominaria.
We follow the story of Akroma, an angel made by the illusionist Ixidor to avenge the death of his wife.
This leads into the corruption of Jeska and the creation of the God of Dominaria's mana, Karona. Karona, the False God, is a powerful being that needs to grow up before she destroys the plane.
In her death, Dominaria is left in a fragile state and teeters on the brink of destruction. It now resides in Teferi to start to heal its wounds.
- Source, Aether Hub