As Foretold (0805) (WHO) – Surge Foil

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At the beginning of your upkeep, put a time counter on this enchantment.
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 this enchantment.

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“It is returning through the dark. And then, Doctor? Oh, but then he will knock four times.”