Mona Lisa without summoning sickness and with power 5 or greater).
Steps
Activate
Mona Lisa by tapping it, adding at least ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate
Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , untapping all creatures you control and causing you to get an additional combat and main phase after this one.
Repeat.
Results
Infinite colored mana.
Infinite combat phases.
Infinite mana creatures you control can produce.
Infinite untap of creatures you control.
Metadata
In 201 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Ruthless (Bracket 4+).