Kindslaver is a rare Legendary Artifact card from The List (Unfinity Foil Edition) (ULST), collector number 58. Current market price: — (foil $0.19), TCGplayer market prices via Scryfall.
{5}, {T}, Sacrifice Kindslaver: A person outside the game controls target player during that player's next turn. Neither player may advise that person until the end of that turn.