Stasis Cell is a common Enchantment — Aura card from Ravnica: City of Guilds (RAV), collector number 66. Current market price: $0.09 (foil $0.23), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature doesn't untap during its controller's untap step. {3}{U}: Attach this Aura to target creature.