Skittering Precursor, Sword of the Meek, Ruination Guide, and Sarcatog

Prerequisites

• Skittering Precursor on the battlefield
• Sword of the Meek on the battlefield
• Ruination Guide on the battlefield
• Sarcatog on the battlefield

Steps

1. Activate Sarcatog's second ability by sacrificing Sword of the Meek
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. Resolve the Sarcatog ability, giving it +1/+1 until end of turn
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite creature tokens
• Infinitely large Sarcatog until end of turn