Slow Motion is a common Enchantment — Aura card from Urza's Legacy (ULG), collector number 42. Current market price: $0.19 (foil $4.36), TCGplayer market prices via Scryfall.
Enchant creature At the beginning of the upkeep of enchanted creature's controller, that player sacrifices that creature unless they pay {2}. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.