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What are the new gameplay mechanics in Ursulas Return

This is an entirely fan-driven format, very much like Commander was when it was still called EDH

For the ultra high value cards this is a much safer way of selling the card than trying to do it yourself, and you're likely to get a higher price than if you were selling it as an individual

In casual play, it could also still be easy to take advantage of its significant power, although it's only fair to do so if both parties are on board with using a card that's been errata'd for a reason

It can arrive at a moment's notice to tap down your opponent's board, preventing an attack or preventing your opponent from defending