Agatha's Soul Cauldron, Kiki-Jiki, Mirror Breaker, and Brimstone Trebuchet

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Kiki-Jiki, Mirror Breaker in exile
• Brimstone Trebuchet on the battlefield

Steps

1. Activate Brimstone Trebuchet using Kiki-Jiki's ability by tapping it, creating a token copy of any nonlegendary Knight you control with haste
2. When the Knight token enters the battlefield, Brimstone Trebuchet triggers, untapping itself
3. Repeat

Results

• Infinite copies of nonlegendary Knights you control with haste
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers