Tromell, Seymour's Butler + Pentad Prism + Sword of the Paruns
Tromell, Seymour's Butler
Pentad Prism
Sword of the Paruns
Infinite colored manaInfinite untap of creatures you controlInfinite mana creatures you control can produceInfinite proliferateInfinite charge counters on a permanent
How it works
Activate Tromell by paying 1 and tapping it, causing you to put at least five charge counters on Pentad Prism.
Activate Pentad Prism five times by removing three charge counters from it, adding five mana of any color(s).
Activate Sword of the Paruns by paying 3, untapping Tromell.