Breath of Fury, and Éowyn, Shieldmaiden

Prerequisites

• Breath of Fury on the battlefield
• Éowyn, Shieldmaiden on the battlefield

Steps

1. At the beginning of your combat phase, Éowyn triggers, creating two creature tokens
2. Deal combat damage using the creature that has Breath of Fury attached
3. Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to a creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one
4. Repeat each combat phase

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite combat damage
• Near-infinite combat phases
• Near-infinite creature tokens with haste
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers
• Near-infinite mana creatures you control can produce
• Near-infinite untap of creatures you control