Jetmir, Nexus of Revels, Skittering Precursor, Sword of the Meek, and Krark-Clan Ironworks

Prerequisites

• Jetmir, Nexus of Revels on the battlefield
• Skittering Precursor on the battlefield
• Sword of the Meek on the battlefield
• Krark-Clan Ironworks on the battlefield

Steps

1. Activate Krark-Clan Ironworks by sacrificing Sword of the Meek, adding
2. Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token
3. When the Eldrazi Spawn enters the battlefield as a 1/1 due to Jetmir, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Eldrazi Spawn
4. Activate the Eldrazi Spawn by sacrificing it, adding
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana