Jegantha and any other desired creature(s) as attackers.
Augusta triggers, as well as
Najeela for each Warrior that was declared an attacker.
Resolve the
Najeela trigger(s), if applicable, creating that many 1/1 Warrior creature tokens that are tapped and attacking.
Resolve the Augusta trigger, untapping all creatures you control.
Activate
Jegantha by tapping it, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) that cannot be spent to pay generic mana costs.
Activate
Najeela by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Repeat each combat phase.
Results
Infinite combat phases.
Infinite creature tokens with haste.
Infinite ETB.
Infinite mana creatures you control can produce.
Infinite untap of creatures you control.
Metadata
In 28 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).