All-Out Assault enters the battlefield, it triggers, causing you to get an additional combat and main phase after this one.
Move to your extra combat phase.
All-Out Assault triggers, untapping each creature you control.
Declare
Carmen as an attacker, triggering its second ability, returning
Leonin Relic-Warder form your graveyard to the battlefield.
When
Leonin Relic-Warder enters the battlefield, its first ability triggers, exiling
All-Out Assault.
Move to your postcombat main phase, and activate
Evereth by sacrificing
Leonin Relic-Warder.
When
Leonin Relic-Warder dies, its second ability and
Carmen's first ability trigger.
Resolve the
Carmen trigger, putting a +1/+1 counter on it and causing you to gain 1 life.
Resolve the
Leonin Relic-Warder trigger, returning
All-Out Assault from exile to the battlefield.
When
All-Out Assault enters the battlefield, it triggers, causing you to get an additional combat and main phase after this one.
Resolve the
Evereth ability.
Repeat from step 3.
Notes
If you have a way to kill
Evereth and ({1} magic symbol) ({BR} magic symbol) available, you can do so after putting a significant amount of +1/+1 counters on it to deal damage to each opponent using its second ability.
Results
Infinite +1/+1 counters on a creature.
Infinite combat phases.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite lifegain.
Infinite lifegain triggers.
Infinite mana creatures you control can produce.
Infinite untap of creatures you control.
Infinite damage.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.