Breath of Fury
Leonin Warleader
Fervor

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Breath of Fury attached to any other creature you control. An opponent cannot block creatures you control.

   Steps

How does this combo work?
1
Declare Leonin Warleader and the creature with Breath of Fury attached as attackers.
2
Leonin Warleader triggers, creating two 1/1 Cat creature tokens.
3
Deal combat damage using the creature that has Breath of Fury attached.
4
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to a Cat token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
5
Repeat each combat phase.

   Results

What do I get from this combo?
Infinite combat damage
Infinite combat phases
Infinite death triggers
Infinite ETB
Infinite LTB
Infinite mana creatures you control can produce
Infinite sacrifice triggers
Infinite untap of creatures you control
Infinite creature tokens with haste
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