Singing Towers of Darillium is a common Plane — Darillium card from Doctor Who (WHO), collector number 598. Current market price: $0.25, TCGplayer market prices via Scryfall.
Each nonland card in your hand without foretell has foretell. Its foretell cost is equal to its mana cost reduced by {2}. (During your turn, you may pay {2} and exile it from your hand face down. Cast it on a later turn for its foretell cost.) Whenever chaos ensues, you may cast a foretold card you own from exile without paying its mana cost this turn.