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 creature tokens with haste.
Infinite ETB.
Infinite colored mana.
Metadata
In 63 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).