Counter target spell. Create X Treasure tokens, where X is that spell's mana value. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")
Spell Swindle has 5 listed printings; the most valuable is the Prerelease printing from PXLN at US$4.30 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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