Infinite Coursework is a common Enchantment — Aura card from Reality Fracture (FRA), collector number 31. Current market price: $0.11 (foil $0.18), TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, tap enchanted creature. It becomes unprepared. Enchanted creature loses all abilities and doesn't untap during its controller's untap step.