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With Neera in play, you can choose to put the spell youre casting on the bottom of your library, and flip cards off of the top until you get a nonland card, which you can then cast for free

Peak Value: $1,500$2,500 USD (est.) (PSA 9) Why It's Valuable: A rare green enchantment from Arabian Nights that acts as repeatable creature removal

There are also a bunch of versions of the basic interaction with this, Myr Turbine, or another other artifact token maker with an artifact sacrifice outlet like Blasting Station

It can often be used like a Squee generating value from discard but it is also a useful card to play out