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It isnt the only card to break out of a specific inks identity, but at such a low cost it has a large impact

Should Panoptic Mirror remained banned or be set free

The graphic they added to the Mystery Booster packs had a square background, and the one they used for The List seems to have a rounded background, which creates a telltale difference in the shape of the cards border as you can see on Chatter of the Squirrel and Ancient Den as well as subtle changes in its placement on new border cards, as seen on Boros Challenger

The flexibility of this card is unmatched by previous iterations of this effect, and that's why I believe it'll be a cornerstone of Blue-based Control decks until it leaves the format