Opponents can not block and kill creatures you control.
Steps
Declare
Najeela and
Beacon Hawk as attackers.
Najeela triggers, creating a 1/1 Warrior creature token that is tapped and attacking.
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.
Deal combat damage with
Najeela and
Beacon Hawk.
Beacon Hawk triggers, untapping
Jegantha.
Repeat each combat phase.
Results
Infinite combat phases.
Infinite creature tokens.
Infinite ETB.
Infinite lifegain.
Infinite lifegain triggers.
Metadata
In 3 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).