As Foretold

At the beginning of your upkeep, put a time counter on this enchantment.
Once each turn, you may pay 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.

EDHREC rank #1894

USD reference: $2.84 (~₱178.41) · Foil: $9.52 (~₱598.05)