Nim Deathmantle, Krark-Clan Ironworks, and Royal Warden

Prerequisites

• Nim Deathmantle on the battlefield
• Krark-Clan Ironworks on the battlefield
• Royal Warden on the battlefield
• available

Steps

1. Activate Krark-Clan Ironworks by sacrificing Royal Warden, adding
2. When Royal Warden dies, Nim Deathmantle triggers, causing you to pay to return Royal Warden from your graveyard to the battlefield and attach Nim Deathmantle to it
3. When Royal Warden enters, it triggers, creating two tapped artifact creature tokens
4. Activate Krark-Clan Ironworks by sacrificing a creature token, adding
5. Repeat

Results

• Infinite artifact ETB
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite tapped artifact tokens
• Infinite tapped creature tokens