Deathrender, Heirloom Blade, Ashnod's Altar, and Sin, Unending Cataclysm

Prerequisites

• Deathrender on the battlefield
• Heirloom Blade on the battlefield
• Ashnod's Altar on the battlefield
• Sin, Unending Cataclysm on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Sin, adding
2. When Sin dies, it, Heirloom Blade and Deathrender trigger
3. Resolve the Sin trigger, shuffling it into your library
4. Resolve the Heirloom Blade trigger, causing you to reveal cards from the top of your library until you reveal a creature that shares a card type with Sin and put it into your hand Resolve the Deathrender trigger, putting the creature from your hand onto the battlefield and attaching Deathrender to it
5. Activate Heirloom Blade's equip ability by paying , attaching it to the creature
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colorless mana
• Infinite death triggers
• Infinite sacrifice triggers