Dawning Purist is a uncommon Creature — Human Cleric card from Onslaught (ONS), collector number 22. Current market price: $0.20 (foil $1.10), TCGplayer market prices via Scryfall.
Whenever this creature deals combat damage to a player, you may destroy target enchantment that player controls. Morph {1}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)