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The Magic Coin (also known as the Universal Coin) is a coin that can turn into any currency of any value in the world.
It is first introduced in "Water Park Prank" when Princess B'Onangutan gets infected with "Daddy Sad Heads". Finn cures her of the sadness effect and later rewards him with the coin. He decides to use it as the gold coin needed to open the lockers at the "Wet Pipes Water Park". He then loses it by accidentally dropping it into a vent.
The coin is a black hexagon with a question mark in its center and blue and red lights on its edges.