I am happy to see that the Magic community website has created media materials that recall the Magic storyline in its early years. There was no superhero planeswalker team at that time and the stories usually happen in the plane of Dominaria.

I have read some of the book novels and on the MTG Wiki about the history of characters and also events that occurred in the past millennia before Urza battled with his brother Mishra and his spark was discovered.

Here is one video material made by Gathering Magic which shows the Brief History of Dominaria. Enjoy!