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https://dotesports.com/news/how-to-change-email-and-password-in-mtg-arena

^explaination of how to change your email/PW. FWIW, it is against the ToS to transfer an arena account.

"We heard you'd like to play digital magic, with the paper card set, on a modern client. Can I interest you in a predatory economy, digital-only cards, drastic & fundamental changes to the game, and...

This feels like another cash grab at the expense of the game. I had hoped that Arena and paper would move towards unification as "remastered" sets are introduced. Jumpstart: Historic Horizons is a...

https://magic.wizards.com/en/articles/archive/magic-digital/mtg-arena-state-beta-june-27-2019

Ranked draft for the current set
Multiple draft formats
'Historic' format