This ingenious engine turns a piece of cheap cardboard into a limitless supply of lands by exploiting a clever cost reduction. Zirda, the Dawnwaker is the silent partner making this math possible, slashing the activation cost of Prototype Portal down to just zero mana because its imprinted card is a Seat of the Synod. Once you tap that newly created Seat of the Synod token for blue mana, you use Filigree Sages to untap your Prototype Portal for a single blue mana. Because Zirda's discount makes the Portal free to activate, you can loop this sequence endlessly to flood the battlefield with infinite land tokens.