Skittering Precursor, Sword of the Meek, Ruination Guide, and Krark-Clan Ironworks

Prerequisites

• Skittering Precursor on the battlefield
• Sword of the Meek on the battlefield
• Ruination Guide 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 Ruination Guide, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Eldrazi Spawn
4. Repeat

Results

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