As Foretold [AKH - 42]

Rarity: M #: 42 Creature Type or Sub Type: Enchantment Rules Text Contains: 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 converted mana cost X or less, where X is the number of time counters on As Foretold.