Sundial of the Infinite is a rare Artifact card from The List (PLST), collector number M12-218. Current market price: — (foil $14.48), TCGplayer market prices via Scryfall.
{1}, {T}: End the turn. Activate only during your turn. (Exile all spells and abilities from the stack. Discard down to your maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)