As Foretold [Amonkhet]

Set: Amonkhet Type: Enchantment Rarity: Mythic Cost: {2}{U} 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.