Stuck in Summoner's Sanctum is a common Enchantment — Aura card from Final Fantasy (FIN), collector number 76. Current market price: $0.16 (foil $0.26), TCGplayer market prices via Scryfall.
Flash Enchant artifact or creature When this Aura enters, tap enchanted permanent. Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.