Curse of Shaken Faith is a rare Enchantment — Aura Curse card from Innistrad: Double Feature (DBL), collector number 134. Current market price: $0.59 (foil $2.83), TCGplayer market prices via Scryfall.
Enchant player Whenever enchanted player casts a spell other than the first spell they cast each turn or copies a spell, this Aura deals 2 damage to them.