The Unbeatable Squirrel Girl by paying ({1} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) , creating a 1/1 Squirrel creature token for each Squirrel you control.
Activate four Squirrels by tapping them, adding ({1} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) .
Repeat.
Notes
You'll create double as many Squirrels each loop. All Squirrels beyond the first four will be untapped and can be used to add additional mana.
Results
Infinite ETB.
Infinite colored mana.
Infinite creature tokens with haste.
Metadata
In 764 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).