Nim Deathmantle, Ashnod's Altar, and Aerid Konstrari

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Aerid Konstrari on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Aerid, adding
2. When Aerid dies, it and Nim Deathmantle trigger
3. Resolve the Aerid trigger, creating a Heartwood token
4. Activate the Heartwood by tapping it, adding
5. Resolve the Nim Deathmantle trigger, causing you to pay to return Aerid from your graveyard to the battlefield and attaching Nim Deathmantle to it, When Aerid enters, it triggers, creating a Heartwood token
6. Activate the Heartwood by tapping it, adding
7. Repeat

Results

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