Toph, the First Metalbender + Candelabra of Tawnos + White Lotus Tile
Toph, the First Metalbender
Candelabra of Tawnos
White Lotus Tile
Infinite colored manaInfinite mana lands you control can produceInfinite untap of nontoken artifacts you controlInfinite mana nontoken artifacts you control can produceInfinite untap of lands you control
How it works
Activate White Lotus Tile by tapping it, adding at least three mana of any color.
Activate Candelabra of Tawnos by paying 2 and tapping it, untapping White Lotus Tile and Candelabra of Tawnos as they are lands due to Toph.
Repeat.
This clever loop transforms your battlefield into a high-powered mana engine by letting Toph, the First Metalbender turn all your nontoken artifacts into lands. Once this foundation is laid, White Lotus Tile masquerades as a land that taps for a massive influx of mana, which is then fed into Candelabra of Tawnos to untap both the White Lotus Tile and the Candelabra itself. Because Toph reclassifies these artifacts as lands, the Candelabra's targeted untap ability applies directly to them, allowing you to generate infinite colored mana and endlessly untap your entire board.