Excava, the Risen Past + Solemnity + Breath of Fury + Anger Combo

Anger in your graveyard.

All other permanents on the battlefield.

Breath of Fury attached to another creature you control with mana value 3 or less. You either control another nontoken creature with mana value 3 or less, or have a creature card with mana value 3 or less in your graveyard. An opponent cannot block creatures you control. You control at least one Mountain.

Declare Excava and the creature with Breath of Fury attached as attackers.

Excava triggers, returning up to one creature with mana value 3 or less from your graveyard to the battlefield. It won't enter with a finality counter on it due to Solemnity.

Deal combat damage using the creature that has Breath of Fury attached.

Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to another creature with mana value 3 or less, then causing you to untap all creatures you control and to get an additional combat phase after this one.

Repeat each combat phase.

Infinite creature ETB

Infinite creature LTB

Infinite combat damage

Infinite combat phases

Infinite death triggers

Infinite mana creatures you control can produce

Infinite creature sacrifice triggers

Infinite untap of creatures you control