Tormod, the Desecrator, Sword of the Meek, Krark-Clan Ironworks, and Engineered Plague

Prerequisites

• Tormod, the Desecrator on the battlefield
• Sword of the Meek in the graveyard
• Krark-Clan Ironworks on the battlefield
• Engineered Plague on the battlefield
• You have a way to cause a 1/1 creature to enter the battlefield under your control
• "Zombie" chosen with Engineered Plague

Steps

1. Cause a 1/1 creature to enter the battlefield under your control
2. Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the 1/1 creature
3. When Sword of the Meek leaves your battlefield, Tormod triggers
4. Holding priority, activate Krark-Clan Ironworks by sacrificing Sword of the Meek, adding
5. Resolve the Tormod trigger, creating a 2/2 Zombie creature token, which becomes a 1/1 due to Engineered Plague
6. Repeat from step 2

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite ETB