That really allows you to flood the board with potential game-ending damage, depending on what you hit with
SIDE QUEST: FINISHED Honestly, there are cards I wouldve added to the list had they been slightly less specific
Ursulas Return Spoilers Revealed Internationally A lot of internationally printed cards have been revealed for Ursulas Return
Honest answer: very playable out of the box, but not optimized
Thing is, planeswalkers get their loyalty counters when they enter the battlefield as a replacement effect, but transforming does not count as entering the battlefield (that's why Sorin's regular transformation tells you to exile it, and then return it transformed)
Each one is completely different from the others, with Teferi's Puzzle Box being a heavily industrial style, Sword to Plowshares looking very death metal album cover-y, and Cut // Ribbons looking like medieval catacombs