Kiki-Jiki, Mirror Breaker, Boommobile, and Umbral Mantle

Prerequisites

• Kiki-Jiki, Mirror Breaker on the battlefield
• Boommobile on the battlefield
• Umbral Mantle on the battlefield
• Boommobile is a creature

Steps

1. Activate Kiki-Jiki by tapping it, creating a token copy of Boommobile with haste
2. When the Boommobile token enters the battlefield, it triggers, adding that can only be spent to activate abilities
3. Activate Kiki-Jiki by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage
• Infinite creature tokens with haste
• Infinite colored mana that can only be spent to activate abilities
• Infinite copies of nonlegendary creatures you control with haste
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn