MTG >Combos >Gemstone Array +Doubling Season +Zirda, the Dawnwaker +

Zirda reduces the cost of your permanents' abilities by two mana. Pay one mana to activate the Gemstone Array's ability, putting a counter on it. Doubling Season's ability will put an additional counter to Gemstone Array Remove a counter from Gemstone Array to add one mana. Repeat the process for infinite mana.