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

2x Creature with Haste and MV <= 3 on the battlefield or in your graveyard.

All other permanents on the battlefield.

Breath of Fury attached to another creature you control. An opponent cannot block creatures you control.

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

Excava triggers, returning up to one creature with haste and 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 a creature with haste and 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 mana creatures you control can produce

Infinite creature sacrifice triggers

Infinite untap of creatures you control

Infinite creature ETB

Infinite creature LTB

Infinite combat damage

Infinite combat phases

Infinite death triggers