Charm School is a uncommon Enchantment card from Unglued (UGL), collector number 1. Current market price: $0.53, TCGplayer market prices via Scryfall.
As this enchantment enters, choose a color and balance this enchantment on your head. Prevent all damage that would be dealt to you by sources of the chosen color. When this enchantment falls off your head, sacrifice this enchantment.