Orthion, Hero of Lavabrink, Priest of Urabrask, and Umbral Mantle

Prerequisites

• Orthion, Hero of Lavabrink on the battlefield
• Priest of Urabrask on the battlefield
• Umbral Mantle on the battlefield
• Orthion does not have summoning sickness
• Umbral Mantle attached to Orthion
• available

Steps

1. Activate Orthion's second ability by paying and tapping it, creating five token copies of Priest of Urabrask with haste
2. When the token Priest of Urabrasks enter the battlefield, they trigger, adding fifteen
3. Activate Orthion by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat
5. Once you have infinite mana, you may target any other creature using Orthion's ability

Results

• Infinite copies of creatures you control
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinitely large Orthion until end of turn
• Infinite red mana
• Infinite sacrifice triggers