Ancient Copper Dragon, Breath of Fury, and Jinnie Fay, Jetmir's Second

Prerequisites

• Ancient Copper Dragon on the battlefield
• Breath of Fury on the battlefield
• Jinnie Fay, Jetmir's Second on the battlefield
• Breath of Fury attached to another creature you control that can attack this turn
• An opponent cannot block creatures you control
• Ancient Copper Dragon does not have summoning sickness

Steps

1. Deal combat damage using the creature that has Breath of Fury attached and Ancient Copper Dragon
2. Breath of Fury and Ancient Copper Dragon triggers
3. Resolve the Ancient Copper Dragon trigger, causing you to roll a d20 and create that many 2/2 Cat creature tokens with haste due to Jinnie Fay
4. Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the 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
6. Once you have infinite Cat tokens, you may instead make Dog tokens using Jinnie Fay or Treasure tokens

Results

• Infinite colored mana
• Infinite combat damage
• Infinite combat phases
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite Treasure tokens