Ghalta and Mavren, Breath of Fury, and Fervor

Prerequisites

• Ghalta and Mavren on the battlefield
• Breath of Fury on the battlefield
• Fervor on the battlefield
• Breath of Fury attached to another creature you control that does not have summoning sickness
• You control at least one additional creature that does not have summoning sickness
• An opponent cannot block and kill creatures you control

Steps

1. Declare the creature with Breath of Fury attached and any other creature you control as attackers
2. Ghalta and Mavren triggers, creating two 1/1 Vampire creature tokens with lifelink
3. Deal combat damage to an opponent using the creature with 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 Vampire 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

• Infinite combat damage
• Infinite combat phases
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of creatures you control