As Foretold (AKH) from Amonkhet, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Tommy Arnold
• Card Text:
  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.