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Likewise, it also works really well in counters decks (like my Hamza, Guardian of Arashin deck), as the cost to prevent your draw will increase as Esper Sentinel gets bigger and bigger, easily making it more costly to pay for than even Rhystic Study

That's really strong, and note that this counts Elf spells, not creatures, so if you are casting Tribal Elf Instants or Sorceries, those will count as well as creatures

Imation teams up with Xerox [online] Available at: [Accessed 22nd July 2020]

The 2021 anniversary sets were a landmark example, with some sealed booster boxes eventually trading at 3x and 4x retail on the secondary market