Mana MagusMagus of the Candelabra Buy + Sword of the Paruns Buy + Mana Reflection Buy
The Reflection can be swapped for Heartbeat of Spring Buy, Mana Flare Buy, Mirari's Wake Buy, Dictate of Karametra Buy, Overabundance Buy, Zhur-Taa Ancient Buy, etc.
As soon as you can produce 4 or more mana from tapping all your lands, this is infinite.
Not original, posting because the previous iteration using Sword was limited to basic lands.
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