{mutavault} + {cackling counterpart} + {parallel lives} + {doubling season} + {chromatic lantern} + {vitu-ghazi guildmage}
Animate mutavault
Cast cackling counterpart targeting the mutavault.
Loop begins
4x mutavault tokens Etb
Populate using guildmage
Loop ends
Infinite mutavaults
Throw in something to double the mana produced by each land and you can replace one of the parallel lives/doubling seasons or get infinite mana as well.