Ashaya, Soul of the Wild + Magus of the Candelabra + Metalworker
Ashaya, Soul of the Wild
Magus of the Candelabra
Metalworker
Infinite colorless manaInfinite mana lands you control can produceInfinite green manaInfinite untap of nontoken creatures you controlInfinite mana nontoken creatures you control can produceInfinite untap of lands you control
How it works
Activate Metalworker by tapping it, revealing at least two artifact cards from your hand and adding at least CCCC.
Activate Magus of the Candelabra by paying 2 and tapping it, untapping it and Metalworker.