As Foretold (Extended Art) (Surge Foil) [Doctor Who]

At the beginning of your upkeep, put a time counter on As Foretold.
Once each turn, you may pay {0} rather than pay the mana cost for a spell you cast with mana value X or less, where X is the number of time counters on As Foretold. “It is returning through the dark. And then, Doctor? Oh, but then he will knock four times.”