All-Out Assault enters the battlefield, it triggers, causing you to get an additional combat and main phase after this one.
Move to your next combat phase, and declare any creature as an attacker.
All-Out Assault triggers, untapping all creatures you control.
Move to your next main phase.
Activate
Felidar Guardian by tapping it, creating a token copy of it with haste.
When the
Felidar Guardian token enters the battlefield,
Felidar Guardian triggers, blinking
All-Out Assault.
Repeat from step 2.
Notes
If
All-Out Assault is on the battlefield to start, skip to step 5 on the first iteration, and then follow the steps as listed. You also do not need mana to start the combo in this scenario.
Results
Infinite LTB.
Infinite ETB.
Infinite combat phases.
Infinite creature tokens with haste.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Metadata
In 2 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).