Declare the creature with Breath of Fury attached and General Kreat as attackers.
General Kreat triggers, creating a creature token.
When the creature token enters, General Kreat triggers, dealing 1 damage to each opponent.
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 the creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.

Infinite ETB

Infinite LTB

Infinite combat damage

Infinite combat phases

Infinite damage

Infinite death triggers

Infinite mana creatures you control can produce

Infinite sacrifice triggers

Infinite untap of creatures you control

Breath of Fury

Barbarian Class

General Kreat, the Boltbringer

Activate Ant Queen by paying {1}{G}, creating two creature tokens.
Activate the creature tokens by tapping them, adding {1}{G}.
Repeat

Infinite tapped creature tokens

Cryptolith Rite

Ant Queen

Chatterfang, Squirrel General

Activate Spawning Pit's second ability by paying {1} and removing two charge counters from it, creating two creature tokens
Activate the tokens by tapping them, adding {G}{G}.
Activate Spawning Pit's first ability twice by sacrificing the tokens, putting two charge counters on Spawning Pit.
Repeat.

Infinite green mana

Jaheira, Friend of the Forest

Spawning Pit

Activate Ant Queen by paying {1}{G}, creating two creature tokens.
Activate the tokens by tapping them, adding {G}{G}.
Repeat

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