Declare the creature with Breath of Fury attached as an attacker.
Razorkin Hordecaller triggers, creating a creature token.
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 death triggers

Infinite mana creatures you control can produce

Infinite sacrifice triggers

Infinite untap of creatures you control

Breath of Fury

Urabrask the Hidden

Razorkin Hordecaller

Activate Jegantha by tapping it, adding {W}{U}{B}{R}{G} that cannot be spent to pay generic mana costs.
Activate Bloodflow Connoisseur by sacrificing Jegantha.
Activate Horde of Notions by paying {W}{U}{B}{R}{G}, causing you to cast Jegantha from your graveyard without paying its mana cost.
Repeat.

Infinite +1/+1 counters on a creature

Infinite storm count

Jegantha, the Wellspring

Horde of Notions

Bloodflow Connoisseur

Cyclops of Eternal Fury

Activate Jegantha by tapping it, adding {W}{U}{B}{R}{G} that cannot be spent to pay generic mana costs.
If Ashling's Command is in your graveyard, activate Horde of Notions by paying {W}{U}{B}{R}{G}, causing you to cast Ashling's Command from your graveyard without paying its mana cost. Otherwise, cast Ashling's Command by paying {3}{U}{R}.
Resolve Ashling's Command, creating a token copy of Jegantha and choosing any of its remaining modes.
Put the tapped Jegantha into your graveyard due to the legend rule.
Repeat using the Jegantha token.

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