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."
![As Foretold (Extended Art) (Surge Foil) [Doctor Who]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/487d314b-5777-5458-abc3-f410d13e00ea.png?v=1768509445&width=1445)