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Three mana is cheap enough that you can use it a bit like card quality and continue to hit those vital land drops

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

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That said, while Exploration, Burgeoning, and Avenger of Zendikar are amazing in the right deck, theyre not essential to winning games and many decks dont actually need or want them