Chishiro, the Shattered Blade, Kaervek, the Spiteful, Sword of the Meek, and Krark-Clan Ironworks

Prerequisites

• Chishiro, the Shattered Blade on the battlefield
• Kaervek, the Spiteful on the battlefield
• Sword of the Meek in hand
• Krark-Clan Ironworks on the battlefield
• available

Steps

1. Cast Sword of the Meek by paying
2. Sword of the Meek enters the battlefield, triggering Chishiro's first ability
3. Holding priority, activate Krark-Clan Ironworks by sacrificing Sword of the Meek, causing target player to mill three cards
4. Resolve the Chishiro trigger, creating a 2/2 Spirit creature token that enters as a 1/1 due to Kaervek
5. The Spirit enters the battlefield, triggering Sword of the Meek, returning Sword of the Meek from your graveyard to the battlefield attached to the Spirit token
6. Repeat from step 2

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite ETB